{"title":"Helix Subwoofer Enclosures","description":"","products":[{"product_id":"proline-x-ported-8-enclosure-loaded-helix-precision-p8w","title":"Proline-X Ported 8\" Enclosure – Loaded with Helix Precision P8W","description":"\u003cstyle\u003e\n.pl-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#cbd5e1;max-width:1100px;margin:0 auto;background:#020617;}\n.pl-wrap *{box-sizing:border-box;}\n.pl-hero{background:linear-gradient(135deg,#020617 0%,#2e1065 100%);padding:54px 36px;text-align:center;color:#fff;}\n.pl-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff;}\n.pl-hero p{font-size:1.1em;font-weight:300;opacity:.93;margin:0 0 22px;color:#cbd5e1;}\n.pl-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;}\n.pl-badge{background:rgba(139,92,246,.18);border:1px solid #8b5cf6;color:#c4b5fd;padding:7px 16px;border-radius:18px;font-size:.8em;font-weight:600;letter-spacing:.4px;}\n.pl-stats{display:flex;flex-wrap:wrap;background:#0f172a;}\n.pl-stat{flex:1 1 200px;text-align:center;padding:26px 16px;border-right:1px solid #1e293b;border-bottom:1px solid #1e293b;}\n.pl-stat .n{display:block;font-size:1.6em;font-weight:800;color:#a78bfa;}\n.pl-stat .l{display:block;font-size:.78em;color:#94a3b8;text-transform:uppercase;letter-spacing:.6px;margin-top:5px;}\n.pl-section{padding:42px 36px;border-bottom:1px solid #1e293b;background:#020617;}\n.pl-section:nth-of-type(even){background:#0f172a;}\n.pl-section h3{color:#fff;font-size:1.45em;font-weight:700;margin:0 0 14px;border-left:4px solid #8b5cf6;padding-left:14px;}\n.pl-section p{margin:0 0 14px;color:#cbd5e1;}\n.pl-section strong{color:#fff;}\n.pl-grid{display:flex;flex-wrap:wrap;gap:18px;margin-top:8px;}\n.pl-card{flex:1 1 280px;background:#0f172a;border:1px solid #1e293b;border-top:3px solid #8b5cf6;border-radius:8px;padding:20px 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th{background:#020617;color:#94a3b8;font-size:.78em;text-transform:uppercase;letter-spacing:.5px;padding:10px 14px;text-align:left;border-bottom:1px solid #334155;}\n.pl-enc-table td{padding:12px 14px;border-bottom:1px solid #1e293b;color:#cbd5e1;font-size:.95em;}\n.pl-enc-table tr:last-child td{border-bottom:none;}\n.pl-opt td{background:#2e1065;color:#fff;font-weight:600;}\n.pl-char{display:block;font-size:.78em;color:#94a3b8;font-weight:400;margin-top:2px;}\n.pl-opt .pl-char{color:#c4b5fd;}\n.pl-graph{background:#020617;border:1px solid #334155;border-radius:8px;padding:14px;margin:18px 0;}\n.pl-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#94a3b8;margin:0 0 10px;}\n.pl-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px;}\n.pl-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#94a3b8;}\n.pl-sw{width:22px;height:3px;border-radius:2px;display:inline-block;}\n.pl-note{background:#1e293b;border:1px solid #334155;border-radius:8px;padding:14px 16px;margin-top:6px;}\n.pl-note p{margin:0;color:#cbd5e1;font-size:13.5px;line-height:1.6;}\n.pl-link{color:#a78bfa;text-decoration:underline;}\n.pl-cta{background:linear-gradient(135deg,#020617 0%,#2e1065 100%);padding:40px 36px;text-align:center;color:#fff;}\n.pl-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0;}\n.pl-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#cbd5e1;}\n@media(max-width:600px){.pl-hero h2{font-size:1.7em;}.pl-section,.pl-enc,.pl-cta,.pl-hero{padding-left:20px;padding-right:20px;}}\n\u003c\/style\u003e\n\u003cdiv class=\"pl-wrap\"\u003e\n\n\u003cdiv class=\"pl-hero\"\u003e\n\u003ch2\u003eProline X Professional Series Enclosure for the Helix Precision P8W\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for the Helix Precision P8W\u003c\/p\u003e\n\u003cdiv class=\"pl-badges\"\u003e\n\u003cspan class=\"pl-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\n\u003cspan class=\"pl-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\n\u003cspan class=\"pl-badge\"\u003e0.75 cu ft Net\u003c\/span\u003e\n\u003cspan class=\"pl-badge\"\u003eFits Helix Precision P8W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"pl-stats\"\u003e\n\u003cdiv class=\"pl-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.75\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pl-stat\"\u003e\n\u003cspan class=\"n\"\u003e36 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eport tuning\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"pl-section\"\u003e\n\u003ch3\u003eBuilt Around the Helix Precision P8W\u003c\/h3\u003e\n\u003cp\u003eNothing about this box is generic. Every layer is cut to the P8W's 36 Hz ported alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"pl-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eWe build this cabinet at \u003cstrong\u003e0.75 cubic feet net\u003c\/strong\u003e. The volume quoted is true net internal airspace, measured after the walls, bracing and driver displacement are accounted for.\u003c\/p\u003e\n\u003cdiv class=\"pl-highlight\"\u003e\n\u003cp\u003e\u003cstrong\u003eTrue net, not marketing net.\u003c\/strong\u003e Internal volume is calculated by summing\neach CNC cut layer's opening, not estimated from external dimensions minus wall thickness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"pl-section\"\u003e\n\u003ch3\u003eTuned to 36 Hz\u003c\/h3\u003e\n\u003cp\u003eThis is a vented build. Port length and area set the system response, not box volume\nalone. We tune this cabinet to \u003cstrong\u003e36 Hz\u003c\/strong\u003e in 0.75 cubic feet net.\nBelow tuning the driver unloads, which is why the port is sized to the volume rather\nthan dropped in to fit the panel.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"pl-section\"\u003e\n\u003ch3\u003eProline X Professional Series Construction\u003c\/h3\u003e\n\u003cp\u003eThis enclosure is cut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3\/4 inch MDF,\na dense 48.5 lb\/ft³ board with a 200 psi internal bond and 410,000 psi MOE.\nThe panels are V-grooved and folded on the seam and dadoed where the bracing lands. Baffles are double layer minimum, with threaded inserts set to the driver's own bolt pattern.\u003c\/p\u003e\n\u003cdiv class=\"pl-grid\"\u003e\n\u003cdiv class=\"pl-card\"\u003e\n\u003ch4\u003eDouble Layer Baffle\u003c\/h4\u003e\n\u003cp\u003eThe baffle is two layers minimum with threaded inserts matched to the driver's own bolt pattern, so mounting hardware loads into steel rather than into MDF.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pl-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired internally with \u003cstrong\u003e12 gauge OFC\u003c\/strong\u003e. No CCA anywhere in the build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pl-card\"\u003e\n\u003ch4\u003eFinished to Match\u003c\/h4\u003e\n\u003cp\u003eThe shell is wrapped in plush black carpet. Built one at a time in Tullahoma, Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"pl-section\"\u003e\n\u003ch3\u003eEnclosure Only or Loaded\u003c\/h3\u003e\n\u003cp\u003eOrder the enclosure bare and mount your own P8W, or order it loaded and we mount the driver, dress the wiring and ship it ready to bolt in.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"pl-cta\"\u003e\n\u003ch3\u003eCut for the Driver, Not the Catalog\u003c\/h3\u003e\n\u003cp\u003eSelect your configuration above. This enclosure ships free to the lower 48 with a 2 year limited warranty, built one at a time in Tullahoma, Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":42269016424537,"sku":"Pro8-P Helix P8W","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-p8-p-ii-ported-enclosure-loaded-with-helix-precision-p8w-subwooferenclosed-subwooferproline-x-373609.jpg?v=1761970438"},{"product_id":"performance-optimized-wedge-sealed-8-enclosure-helix-ik-w8","title":"Helix IK W8 Box: Sealed 8\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e8\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.40 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.673 to 0.674\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e15.34\" x 11.75\" x 6.07\/10.35\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK W8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W8, a 50.8 mm coil on a 219 square centimeter cone with 8 mm of one-way travel, in a 3.98 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 10 litres for the SVC2 and 8 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.673 with the SVC2 and 0.674 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net the Helix IK W8 runs a system Qtc of \u003cstrong\u003e0.673 to 0.674\u003c\/strong\u003e with resonance at 56.6 to 60.8 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.673 to 0.674 · fc 56.6 to 60.8 Hz · F3 59.6 to 64.0 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.6 to 64.0 Hz anechoic, before any cabin gain. Helix's own datasheet prints 50 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 50 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 7.1700 in. The IK W8 needs 3.98 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK W8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W8: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net at Qtc 0.673 to 0.674, F3 59.6 to 64.0 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47753952165977,"sku":"PO 8-S W IKW8 BB","price":269.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47753956556889,"sku":"PO 8-S W IKW8 B","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8-S_W_IKW8_Front.jpg?v=1793933475"},{"product_id":"performance-optimized-down-fire-sealed-8-enclosure-helix-ik-w8","title":"Helix IK W8 Box: Sealed 8\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e8\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.40 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.673 to 0.674\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e18.19\" x 15\" x 5.48\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK W8 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W8, a 50.8 mm coil on a 219 square centimeter cone with 8 mm of one-way travel, in a 3.98 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 10 litres for the SVC2 and 8 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.673 with the SVC2 and 0.674 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy This One Is Narrower\u003c\/h2\u003e\n\u003cp\u003eThis cabinet is 18.19 inches wide rather than the 30 inches a Proline X down fire normally runs. That is deliberate. A 30 inch footprint holds more air than the IK W8 wants, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 18.19 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net the Helix IK W8 runs a system Qtc of \u003cstrong\u003e0.673 to 0.674\u003c\/strong\u003e with resonance at 56.6 to 60.8 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.673 to 0.674 · fc 56.6 to 60.8 Hz · F3 59.6 to 64.0 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.6 to 64.0 Hz anechoic, before any cabin gain. Helix's own datasheet prints 50 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 50 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 7.1700 in. The IK W8 needs 3.98 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK W8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W8: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net at Qtc 0.673 to 0.674, F3 59.6 to 64.0 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47753956622425,"sku":"PO 8-S DF IKW8","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8-S_DF_IKW8_Front.jpg?v=1793933749"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-helix-ik-w8","title":"Helix IK W8 Dual Box: Sealed 8\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 8\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.40 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.673 to 0.674\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.24\" x 11\" x 6.23\/10.23\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK W8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W8, a 50.8 mm coil on a 219 square centimeter cone with 8 mm of one-way travel, in a 3.98 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 10 litres for the SVC2 and 8 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.673 with the SVC2 and 0.674 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK W8 its own sealed 0.40 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net per driver the Helix IK W8 runs a system Qtc of \u003cstrong\u003e0.673 to 0.674\u003c\/strong\u003e with resonance at 56.6 to 60.8 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.673 to 0.674 · fc 56.6 to 60.8 Hz · F3 59.6 to 64.0 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.6 to 64.0 Hz anechoic, before any cabin gain. Helix's own datasheet prints 50 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 50 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 7.1700 in. The IK W8 needs 3.98 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W8 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net per driver at Qtc 0.673 to 0.674, F3 59.6 to 64.0 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47753958981721,"sku":"PO 8D-S W IKW8 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47753960194137,"sku":"PO 8D-S W IKW8 B","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_W_IKW8_Front.jpg?v=1793933484"},{"product_id":"performance-optimized-down-fire-sealed-dual-8-enclosure-helix-ik-w8","title":"Helix IK W8 Dual Box: Sealed 8\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 8\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.40 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.673 to 0.674\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.00\" x 15\" x 5.96\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK W8 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W8, a 50.8 mm coil on a 219 square centimeter cone with 8 mm of one-way travel, in a 3.98 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 10 litres for the SVC2 and 8 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.673 with the SVC2 and 0.674 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK W8 its own sealed 0.40 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 30.00 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net per driver the Helix IK W8 runs a system Qtc of \u003cstrong\u003e0.673 to 0.674\u003c\/strong\u003e with resonance at 56.6 to 60.8 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.673 to 0.674 · fc 56.6 to 60.8 Hz · F3 59.6 to 64.0 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.6 to 64.0 Hz anechoic, before any cabin gain. Helix's own datasheet prints 50 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 50 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 7.1700 in. The IK W8 needs 3.98 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W8 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net per driver at Qtc 0.673 to 0.674, F3 59.6 to 64.0 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47753960292441,"sku":"PO 8D-S DF IKW8","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_IKW8_Front.jpg?v=1793933756"},{"product_id":"performance-optimized-wedge-sealed-10-enclosure-helix-ik-w10","title":"Helix IK W10 Box: Sealed 10\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e10\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.53 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.59 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.670 to 0.705\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e16.87\" x 13\" x 6.80\/11.53\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK W10 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W10, a 50.8 mm coil on a 333 square centimeter cone with 8 mm of one-way travel, in a 4.96 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 15 litres for the SVC2 and 12 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.670 with the SVC2 and 0.705 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W10\u003c\/h2\u003e\n\u003cp\u003eAt 0.53 cubic feet net the Helix IK W10 runs a system Qtc of \u003cstrong\u003e0.670 to 0.705\u003c\/strong\u003e with resonance at 52.3 to 65.1 Hz. That is Helix's own recommended sealed volume for this driver, 15 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.670 to 0.705 · fc 52.3 to 65.1 Hz · F3 55.4 to 65.3 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 55.4 to 65.3 Hz anechoic, before any cabin gain. Helix's own datasheet prints 45 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 9.1300 in. The IK W10 needs 4.96 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK W10 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W10: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.53 cubic feet net at Qtc 0.670 to 0.705, F3 55.4 to 65.3 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47753961504857,"sku":"PO 10-S W IKW10 BB","price":289.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47753962717273,"sku":"PO 10-S W IKW10 B","price":269.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10-S_W_IKW10_Front.jpg?v=1793933493"},{"product_id":"performance-optimized-down-fire-sealed-10-enclosure-helix-ik-w10","title":"Helix IK W10 Box: Sealed 10\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e10\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.53 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.59 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.670 to 0.705\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e20.38\" x 15\" x 6.46\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK W10 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W10, a 50.8 mm coil on a 333 square centimeter cone with 8 mm of one-way travel, in a 4.96 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 15 litres for the SVC2 and 12 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.670 with the SVC2 and 0.705 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy This One Is Narrower\u003c\/h2\u003e\n\u003cp\u003eThis cabinet is 20.38 inches wide rather than the 30 inches a Proline X down fire normally runs. That is deliberate. A 30 inch footprint holds more air than the IK W10 wants, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 20.38 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W10\u003c\/h2\u003e\n\u003cp\u003eAt 0.53 cubic feet net the Helix IK W10 runs a system Qtc of \u003cstrong\u003e0.670 to 0.705\u003c\/strong\u003e with resonance at 52.3 to 65.1 Hz. That is Helix's own recommended sealed volume for this driver, 15 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.670 to 0.705 · fc 52.3 to 65.1 Hz · F3 55.4 to 65.3 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 55.4 to 65.3 Hz anechoic, before any cabin gain. Helix's own datasheet prints 45 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 9.1300 in. The IK W10 needs 4.96 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK W10 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W10: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.53 cubic feet net at Qtc 0.670 to 0.705, F3 55.4 to 65.3 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47753962782809,"sku":"PO 10-S DF IKW10","price":279.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10-S_DF_IKW10_Front.jpg?v=1793933764"},{"product_id":"performance-optimized-wedge-sealed-dual-10-enclosure-helix-ik-w10","title":"Helix IK W10 Dual Box: Sealed 10\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 10\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.53 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.60 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.670 to 0.705\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e27.46\" x 15\" x 6.40\/11.86\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK W10 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W10, a 50.8 mm coil on a 333 square centimeter cone with 8 mm of one-way travel, in a 4.96 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 15 litres for the SVC2 and 12 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.670 with the SVC2 and 0.705 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK W10 its own sealed 0.60 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W10\u003c\/h2\u003e\n\u003cp\u003eAt 0.53 cubic feet net per driver the Helix IK W10 runs a system Qtc of \u003cstrong\u003e0.670 to 0.705\u003c\/strong\u003e with resonance at 52.3 to 65.1 Hz. That is Helix's own recommended sealed volume for this driver, 15 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.670 to 0.705 · fc 52.3 to 65.1 Hz · F3 55.4 to 65.3 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 55.4 to 65.3 Hz anechoic, before any cabin gain. Helix's own datasheet prints 45 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 9.1300 in. The IK W10 needs 4.96 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W10 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.53 cubic feet net per driver at Qtc 0.670 to 0.705, F3 55.4 to 65.3 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47753963995225,"sku":"PO 10D-S W IKW10 BB","price":399.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47753964060761,"sku":"PO 10D-S W IKW10 B","price":379.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10D-S_W_IKW10_Front.jpg?v=1793933502"},{"product_id":"performance-optimized-down-fire-sealed-dual-10-enclosure-helix-ik-w10","title":"Helix IK W10 Dual Box: Sealed 10\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 10\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.53 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.60 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.670 to 0.705\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.00\" x 15\" x 7.80\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK W10 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W10, a 50.8 mm coil on a 333 square centimeter cone with 8 mm of one-way travel, in a 4.96 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 15 litres for the SVC2 and 12 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.670 with the SVC2 and 0.705 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK W10 its own sealed 0.60 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 30.00 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W10\u003c\/h2\u003e\n\u003cp\u003eAt 0.53 cubic feet net per driver the Helix IK W10 runs a system Qtc of \u003cstrong\u003e0.670 to 0.705\u003c\/strong\u003e with resonance at 52.3 to 65.1 Hz. That is Helix's own recommended sealed volume for this driver, 15 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.670 to 0.705 · fc 52.3 to 65.1 Hz · F3 55.4 to 65.3 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 55.4 to 65.3 Hz anechoic, before any cabin gain. Helix's own datasheet prints 45 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 9.1300 in. The IK W10 needs 4.96 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W10 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.53 cubic feet net per driver at Qtc 0.670 to 0.705, F3 55.4 to 65.3 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47753965273177,"sku":"PO 10D-S DF IKW10","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10D-S_DF_IKW10_Front.jpg?v=1793933772"},{"product_id":"performance-optimized-wedge-sealed-12-enclosure-helix-ik-w12","title":"Helix IK W12 Box: Sealed 12\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e12\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.87 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.820 to 0.868\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e18.74\" x 15\" x 7.11\/12.57\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK W12 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W12, a 50.8 mm coil on a 515 square centimeter cone with 8 mm of one-way travel, in a 5.67 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.868 with the SVC2 and 0.820 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net the Helix IK W12 runs a system Qtc of \u003cstrong\u003e0.820 to 0.868\u003c\/strong\u003e with resonance at 57.2 to 64.0 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.820 to 0.868 · fc 57.2 to 64.0 Hz · F3 48.5 to 56.4 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 48.5 to 56.4 Hz anechoic, before any cabin gain. Helix's own datasheet prints 40 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 37 Hz, Q 1.6 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 11.2600 in. The IK W12 needs 5.67 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK W12 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W12: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net at Qtc 0.820 to 0.868, F3 48.5 to 56.4 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47753966583897,"sku":"PO 12-S W IKW12 BB","price":369.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47753966616665,"sku":"PO 12-S W IKW12 B","price":349.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12-S_W_IKW12_Front.jpg?v=1793933512"},{"product_id":"performance-optimized-down-fire-sealed-12-enclosure-helix-ik-w12","title":"Helix IK W12 Box: Sealed 12\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e12\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.87 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.820 to 0.868\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e25.03\" x 15\" x 7.17\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK W12 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W12, a 50.8 mm coil on a 515 square centimeter cone with 8 mm of one-way travel, in a 5.67 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.868 with the SVC2 and 0.820 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy This One Is Narrower\u003c\/h2\u003e\n\u003cp\u003eThis cabinet is 25.03 inches wide rather than the 30 inches a Proline X down fire normally runs. That is deliberate. A 30 inch footprint holds more air than the IK W12 wants, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 25.03 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net the Helix IK W12 runs a system Qtc of \u003cstrong\u003e0.820 to 0.868\u003c\/strong\u003e with resonance at 57.2 to 64.0 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.820 to 0.868 · fc 57.2 to 64.0 Hz · F3 48.5 to 56.4 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 48.5 to 56.4 Hz anechoic, before any cabin gain. Helix's own datasheet prints 40 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 37 Hz, Q 1.6 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 11.2600 in. The IK W12 needs 5.67 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK W12 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W12: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net at Qtc 0.820 to 0.868, F3 48.5 to 56.4 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47753967829081,"sku":"PO 12-S DF IKW12","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12-S_DF_IKW12_Front.jpg?v=1793933779"},{"product_id":"performance-optimized-wedge-sealed-dual-12-enclosure-helix-ik-w12","title":"Helix IK W12 Dual Box: Sealed 12\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 12\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.88 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.820 to 0.868\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 16\" x 7.19\/13.02\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK W12 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W12, a 50.8 mm coil on a 515 square centimeter cone with 8 mm of one-way travel, in a 5.67 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.868 with the SVC2 and 0.820 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK W12 its own sealed 0.88 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net per driver the Helix IK W12 runs a system Qtc of \u003cstrong\u003e0.820 to 0.868\u003c\/strong\u003e with resonance at 57.2 to 64.0 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.820 to 0.868 · fc 57.2 to 64.0 Hz · F3 48.5 to 56.4 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 48.5 to 56.4 Hz anechoic, before any cabin gain. Helix's own datasheet prints 40 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 37 Hz, Q 1.6 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 11.2600 in. The IK W12 needs 5.67 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W12 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net per driver at Qtc 0.820 to 0.868, F3 48.5 to 56.4 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47753967861849,"sku":"PO 12D-S W IKW12 BB","price":429.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47753969074265,"sku":"PO 12D-S W IKW12 B","price":409.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12D-S_W_IKW12_Front.jpg?v=1793933520"},{"product_id":"performance-optimized-down-fire-sealed-dual-12-enclosure-helix-ik-w12","title":"Helix IK W12 Dual Box: Sealed 12\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 12\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.88 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.820 to 0.868\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.00\" x 15\" x 10.45\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK W12 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK W12, a 50.8 mm coil on a 515 square centimeter cone with 8 mm of one-way travel, in a 5.67 inch mounting depth. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.868 with the SVC2 and 0.820 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK W12 its own sealed 0.88 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 30.00 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK W12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net per driver the Helix IK W12 runs a system Qtc of \u003cstrong\u003e0.820 to 0.868\u003c\/strong\u003e with resonance at 57.2 to 64.0 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.820 to 0.868 · fc 57.2 to 64.0 Hz · F3 48.5 to 56.4 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 48.5 to 56.4 Hz anechoic, before any cabin gain. Helix's own datasheet prints 40 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 37 Hz, Q 1.6 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 11.2600 in. The IK W12 needs 5.67 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK W12 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net per driver at Qtc 0.820 to 0.868, F3 48.5 to 56.4 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47753970286681,"sku":"PO 12D-S DF IKW12","price":359.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12D-S_DF_IKW12_Front.jpg?v=1793933787"},{"product_id":"performance-optimized-wedge-sealed-8-enclosure-helix-ik-s8","title":"Helix IK S8 Box: Sealed 8\" Shallow Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK S8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e8\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.39 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.725 to 0.739\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e17.62\" x 11.75\" x 5.22\/9.50\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK S8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S8, the shallow eight: a 222 square centimeter cone with 6 mm of one-way travel in a 3.13 inch mounting depth, against 3.98 for the IK W8. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 10 litres. That is what this cabinet is cut to, giving Qtc 0.725 with the SVC2 and 0.739 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net the Helix IK S8 runs a system Qtc of \u003cstrong\u003e0.725 to 0.739\u003c\/strong\u003e with resonance at 62.3 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.725 to 0.739 · fc 62.3 Hz · F3 59.7 to 60.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.7 to 60.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 46 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 7.1000 in. The IK S8 needs 3.13 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK S8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S8: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net at Qtc 0.725 to 0.739, F3 59.7 to 60.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47754153656409,"sku":"PO 8-S W IKS8 BB","price":269.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47754153689177,"sku":"PO 8-S W IKS8 B","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8-S_W_IKS8_Front.jpg?v=1793933530"},{"product_id":"performance-optimized-down-fire-sealed-8-enclosure-helix-ik-s8","title":"Helix IK S8 Box: Sealed 8\" Shallow Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK S8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e8\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.39 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.725 to 0.739\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e23.46\" x 15\" x 4.63\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK S8 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S8, the shallow eight: a 222 square centimeter cone with 6 mm of one-way travel in a 3.13 inch mounting depth, against 3.98 for the IK W8. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 10 litres. That is what this cabinet is cut to, giving Qtc 0.725 with the SVC2 and 0.739 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy This One Is Narrower\u003c\/h2\u003e\n\u003cp\u003eThis cabinet is 23.46 inches wide rather than the 30 inches a Proline X down fire normally runs. That is deliberate. A 30 inch footprint holds more air than the IK S8 wants, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 23.46 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net the Helix IK S8 runs a system Qtc of \u003cstrong\u003e0.725 to 0.739\u003c\/strong\u003e with resonance at 62.3 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.725 to 0.739 · fc 62.3 Hz · F3 59.7 to 60.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.7 to 60.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 46 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 7.1000 in. The IK S8 needs 3.13 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK S8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S8: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net at Qtc 0.725 to 0.739, F3 59.7 to 60.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47754153754713,"sku":"PO 8-S DF IKS8","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8-S_DF_IKS8_Front.jpg?v=1793933794"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-helix-ik-s8","title":"Helix IK S8 Dual Box: Sealed 8\" Shallow Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK S8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 8\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.39 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.725 to 0.739\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 11\" x 5.85\/9.85\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK S8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S8, the shallow eight: a 222 square centimeter cone with 6 mm of one-way travel in a 3.13 inch mounting depth, against 3.98 for the IK W8. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 10 litres. That is what this cabinet is cut to, giving Qtc 0.725 with the SVC2 and 0.739 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK S8 its own sealed 0.39 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net per driver the Helix IK S8 runs a system Qtc of \u003cstrong\u003e0.725 to 0.739\u003c\/strong\u003e with resonance at 62.3 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.725 to 0.739 · fc 62.3 Hz · F3 59.7 to 60.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.7 to 60.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 46 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 7.1000 in. The IK S8 needs 3.13 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S8 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net per driver at Qtc 0.725 to 0.739, F3 59.7 to 60.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47754154934361,"sku":"PO 8D-S W IKS8 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47754155556953,"sku":"PO 8D-S W IKS8 B","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_W_IKS8_Front.jpg?v=1793933539"},{"product_id":"performance-optimized-down-fire-sealed-dual-8-enclosure-helix-ik-s8","title":"Helix IK S8 Dual Box: Sealed 8\" Shallow Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK S8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 8\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.35 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.39 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.725 to 0.739\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.00\" x 15\" x 5.92\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK S8 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S8, the shallow eight: a 222 square centimeter cone with 6 mm of one-way travel in a 3.13 inch mounting depth, against 3.98 for the IK W8. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 10 litres. That is what this cabinet is cut to, giving Qtc 0.725 with the SVC2 and 0.739 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK S8 its own sealed 0.39 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 30.00 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S8\u003c\/h2\u003e\n\u003cp\u003eAt 0.35 cubic feet net per driver the Helix IK S8 runs a system Qtc of \u003cstrong\u003e0.725 to 0.739\u003c\/strong\u003e with resonance at 62.3 Hz. That is Helix's own recommended sealed volume for this driver, 10 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.725 to 0.739 · fc 62.3 Hz · F3 59.7 to 60.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 59.7 to 60.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 46 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 7.1000 in. The IK S8 needs 3.13 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S8 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.35 cubic feet net per driver at Qtc 0.725 to 0.739, F3 59.7 to 60.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47754155589721,"sku":"PO 8D-S DF IKS8","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_IKS8_Front.jpg?v=1793933802"},{"product_id":"performance-optimized-wedge-sealed-10-enclosure-helix-ik-s10","title":"Helix IK S10 Box: Sealed 10\" Shallow Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK S10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e10\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.49 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.55 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.833 to 0.862\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e20.56\" x 13\" x 5.17\/9.90\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK S10 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S10, the shallow ten: a 353 square centimeter cone with 6 mm of one-way travel in a 3.33 inch mounting depth, against 4.96 for the IK W10. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 14 litres. That is what this cabinet is cut to, giving Qtc 0.862 with the SVC2 and 0.833 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S10\u003c\/h2\u003e\n\u003cp\u003eAt 0.49 cubic feet net the Helix IK S10 runs a system Qtc of \u003cstrong\u003e0.833 to 0.862\u003c\/strong\u003e with resonance at 62.5 to 63.0 Hz. That is Helix's own recommended sealed volume for this driver, 14 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.833 to 0.862 · fc 62.5 to 63.0 Hz · F3 53.3 to 54.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 53.3 to 54.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.3 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 9.0100 in. The IK S10 needs 3.33 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK S10 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S10: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.49 cubic feet net at Qtc 0.833 to 0.862, F3 53.3 to 54.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47754156310617,"sku":"PO 10-S W IKS10 BB","price":289.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47754156605529,"sku":"PO 10-S W IKS10 B","price":269.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10-S_W_IKS10_Front.jpg?v=1793933548"},{"product_id":"performance-optimized-down-fire-sealed-10-enclosure-helix-ik-s10","title":"Helix IK S10 Box: Sealed 10\" Shallow Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK S10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e10\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.49 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.54 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.833 to 0.862\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e29.45\" x 15\" x 4.83\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK S10 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S10, the shallow ten: a 353 square centimeter cone with 6 mm of one-way travel in a 3.33 inch mounting depth, against 4.96 for the IK W10. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 14 litres. That is what this cabinet is cut to, giving Qtc 0.862 with the SVC2 and 0.833 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy This One Is Narrower\u003c\/h2\u003e\n\u003cp\u003eThis cabinet is 29.45 inches wide rather than the 30 inches a Proline X down fire normally runs. That is deliberate. A 30 inch footprint holds more air than the IK S10 wants, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 29.45 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S10\u003c\/h2\u003e\n\u003cp\u003eAt 0.49 cubic feet net the Helix IK S10 runs a system Qtc of \u003cstrong\u003e0.833 to 0.862\u003c\/strong\u003e with resonance at 62.5 to 63.0 Hz. That is Helix's own recommended sealed volume for this driver, 14 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.833 to 0.862 · fc 62.5 to 63.0 Hz · F3 53.3 to 54.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 53.3 to 54.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.3 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 9.0100 in. The IK S10 needs 3.33 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK S10 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S10: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.49 cubic feet net at Qtc 0.833 to 0.862, F3 53.3 to 54.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47754157326425,"sku":"PO 10-S DF IKS10","price":279.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10-S_DF_IKS10_Front.jpg?v=1793933809"},{"product_id":"performance-optimized-wedge-sealed-dual-10-enclosure-helix-ik-s10","title":"Helix IK S10 Dual Box: Sealed 10\" Shallow Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK S10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 10\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.49 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.55 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.833 to 0.862\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 15\" x 5.05\/10.51\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK S10 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S10, the shallow ten: a 353 square centimeter cone with 6 mm of one-way travel in a 3.33 inch mounting depth, against 4.96 for the IK W10. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 14 litres. That is what this cabinet is cut to, giving Qtc 0.862 with the SVC2 and 0.833 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK S10 its own sealed 0.55 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S10\u003c\/h2\u003e\n\u003cp\u003eAt 0.49 cubic feet net per driver the Helix IK S10 runs a system Qtc of \u003cstrong\u003e0.833 to 0.862\u003c\/strong\u003e with resonance at 62.5 to 63.0 Hz. That is Helix's own recommended sealed volume for this driver, 14 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.833 to 0.862 · fc 62.5 to 63.0 Hz · F3 53.3 to 54.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 53.3 to 54.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.3 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 9.0100 in. The IK S10 needs 3.33 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S10 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.49 cubic feet net per driver at Qtc 0.833 to 0.862, F3 53.3 to 54.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47754158145625,"sku":"PO 10D-S W IKS10 BB","price":399.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47754158211161,"sku":"PO 10D-S W IKS10 B","price":379.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10D-S_W_IKS10_Front.jpg?v=1793933557"},{"product_id":"performance-optimized-down-fire-sealed-dual-10-enclosure-helix-ik-s10","title":"Helix IK S10 Dual Box: Sealed 10\" Shallow Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK S10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 10\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.49 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.55 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.833 to 0.862\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.00\" x 15\" x 7.38\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK S10 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S10, the shallow ten: a 353 square centimeter cone with 6 mm of one-way travel in a 3.33 inch mounting depth, against 4.96 for the IK W10. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 14 litres. That is what this cabinet is cut to, giving Qtc 0.862 with the SVC2 and 0.833 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK S10 its own sealed 0.55 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 30.00 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S10\u003c\/h2\u003e\n\u003cp\u003eAt 0.49 cubic feet net per driver the Helix IK S10 runs a system Qtc of \u003cstrong\u003e0.833 to 0.862\u003c\/strong\u003e with resonance at 62.5 to 63.0 Hz. That is Helix's own recommended sealed volume for this driver, 14 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.833 to 0.862 · fc 62.5 to 63.0 Hz · F3 53.3 to 54.8 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 53.3 to 54.8 Hz anechoic, before any cabin gain. Helix's own datasheet prints 46 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.3 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 9.0100 in. The IK S10 needs 3.33 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S10 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.49 cubic feet net per driver at Qtc 0.833 to 0.862, F3 53.3 to 54.8 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47754158243929,"sku":"PO 10D-S DF IKS10","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10D-S_DF_IKS10_Front.jpg?v=1793933817"},{"product_id":"performance-optimized-wedge-sealed-12-enclosure-helix-ik-s12","title":"Helix IK S12 Box: Sealed 12\" Shallow Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK S12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e12\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.85 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.753 to 0.806\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e24.68\" x 15\" x 5.20\/10.66\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK S12 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S12, the shallow twelve: a 523 square centimeter cone with 8 mm of one-way travel in a 3.76 inch mounting depth, against 5.67 for the IK W12. That is genuine shallow-mount depth on a twelve. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.753 with the SVC2 and 0.806 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net the Helix IK S12 runs a system Qtc of \u003cstrong\u003e0.753 to 0.806\u003c\/strong\u003e with resonance at 55.7 to 60.4 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.753 to 0.806 · fc 55.7 to 60.4 Hz · F3 52.5 to 53.9 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 52.5 to 53.9 Hz anechoic, before any cabin gain. Helix's own datasheet prints 39 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 35 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 10.9000 in. The IK S12 needs 3.76 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK S12 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S12: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net at Qtc 0.753 to 0.806, F3 52.5 to 53.9 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47754161422425,"sku":"PO 12-S W IKS12 BB","price":369.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47754163585113,"sku":"PO 12-S W IKS12 B","price":349.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12-S_W_IKS12_Front.jpg?v=1793933566"},{"product_id":"performance-optimized-down-fire-sealed-12-enclosure-helix-ik-s12","title":"Helix IK S12 Box: Sealed 12\" Shallow Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK S12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e12\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.85 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.753 to 0.806\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.00\" x 15\" x 6.22\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IK S12 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S12, the shallow twelve: a 523 square centimeter cone with 8 mm of one-way travel in a 3.76 inch mounting depth, against 5.67 for the IK W12. That is genuine shallow-mount depth on a twelve. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.753 with the SVC2 and 0.806 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 30.00 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net the Helix IK S12 runs a system Qtc of \u003cstrong\u003e0.753 to 0.806\u003c\/strong\u003e with resonance at 55.7 to 60.4 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.753 to 0.806 · fc 55.7 to 60.4 Hz · F3 52.5 to 53.9 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 52.5 to 53.9 Hz anechoic, before any cabin gain. Helix's own datasheet prints 39 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 35 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 10.9000 in. The IK S12 needs 3.76 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IK S12 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and they wire differently. The \u003cstrong\u003eSVC2\u003c\/strong\u003e is a single 2 ohm coil, so one driver presents \u003cstrong\u003e2 ohms\u003c\/strong\u003e and there is nothing to decide. The \u003cstrong\u003eDVC2\u003c\/strong\u003e carries two 2 ohm coils: in parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS. Aim for roughly 210 to 300 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S12: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net at Qtc 0.753 to 0.806, F3 52.5 to 53.9 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47754163617881,"sku":"PO 12-S DF IKS12","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12-S_DF_IKS12_Front.jpg?v=1793933825"},{"product_id":"performance-optimized-wedge-sealed-dual-12-enclosure-helix-ik-s12","title":"Helix IK S12 Dual Box: Sealed 12\" Shallow Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IK S12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 12\" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.87 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.753 to 0.806\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 16\" x 7.09\/12.92\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK S12 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S12, the shallow twelve: a 523 square centimeter cone with 8 mm of one-way travel in a 3.76 inch mounting depth, against 5.67 for the IK W12. That is genuine shallow-mount depth on a twelve. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.753 with the SVC2 and 0.806 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK S12 its own sealed 0.87 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net per driver the Helix IK S12 runs a system Qtc of \u003cstrong\u003e0.753 to 0.806\u003c\/strong\u003e with resonance at 55.7 to 60.4 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.753 to 0.806 · fc 55.7 to 60.4 Hz · F3 52.5 to 53.9 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 52.5 to 53.9 Hz anechoic, before any cabin gain. Helix's own datasheet prints 39 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 35 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 10.9000 in. The IK S12 needs 3.76 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S12 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net per driver at Qtc 0.753 to 0.806, F3 52.5 to 53.9 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":47754163650649,"sku":"PO 12D-S W IKS12 BB","price":429.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47754163716185,"sku":"PO 12D-S W IKS12 B","price":409.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12D-S_W_IKS12_Front.jpg?v=1793933574"},{"product_id":"performance-optimized-down-fire-sealed-dual-12-enclosure-helix-ik-s12","title":"Helix IK S12 Dual Box: Sealed 12\" Shallow Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IK S12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 12\" Sealed Down Fire Enclosure | Floor-Firing Trunk or Cargo Design\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.78 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.87 ft3 Gross Per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.753 to 0.806\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e30.00\" x 15\" x 10.34\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IK S12 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IK S12, the shallow twelve: a 523 square centimeter cone with 8 mm of one-way travel in a 3.76 inch mounting depth, against 5.67 for the IK W12. That is genuine shallow-mount depth on a twelve. The alignment below is computed from Helix's published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eHelix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, but on this model they land on the same recommended volume, 22 litres. That is what this cabinet is cut to, giving Qtc 0.753 with the SVC2 and 0.806 with the DVC2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IK S12 its own sealed 0.87 cu ft gross chamber and its own polyfill. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular 30.00 by 15 inch footprint stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IK S12\u003c\/h2\u003e\n\u003cp\u003eAt 0.78 cubic feet net per driver the Helix IK S12 runs a system Qtc of \u003cstrong\u003e0.753 to 0.806\u003c\/strong\u003e with resonance at 55.7 to 60.4 Hz. That is Helix's own recommended sealed volume for this driver, 22 litres, and it is a net figure in their documentation exactly as it is in ours.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.753 to 0.806 · fc 55.7 to 60.4 Hz · F3 52.5 to 53.9 Hz anechoic\u003c\/p\u003e\n\u003ch3\u003eOn That F3 Figure\u003c\/h3\u003e\n\u003cp\u003eHalf power lands at 52.5 to 53.9 Hz anechoic, before any cabin gain. Helix's own datasheet prints 39 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 35 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 10.9000 in. The IK S12 needs 3.76 in of mounting depth and this cabinet clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IK W series comes in two coil versions and a pair wires differently in each. Two \u003cstrong\u003eSVC2\u003c\/strong\u003e drivers, each a single 2 ohm coil, give \u003cstrong\u003e1 ohm\u003c\/strong\u003e in parallel or \u003cstrong\u003e4 ohms\u003c\/strong\u003e in series. Two \u003cstrong\u003eDVC2\u003c\/strong\u003e drivers give more choices; the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 600 watts RMS total across the pair. Aim for roughly 420 to 600 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IK S12 Dual: Built to Helix's Own Volume\u003c\/h2\u003e\n\u003cp\u003e0.78 cubic feet net per driver at Qtc 0.753 to 0.806, F3 52.5 to 53.9 Hz anechoic, cut direct fit and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47754163748953,"sku":"PO 12D-S DF IKS12","price":369.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12D-S_DF_IKS12_Front.jpg?v=1793933832"},{"product_id":"performance-optimized-wedge-sealed-8-enclosure-helix-iq-w8","title":"Helix IQ W8 Box: Sealed 8\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IQ W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e8\" Sealed Wedge Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.29 to 0.88 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.640 to 0.695\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.9 to 68.2 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IQ W8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W8: a 222 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The same cone area as the IK S8 on more than four times the excursion and two and a half times the power. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 6 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.69 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e6 L\u003c\/td\u003e\n\u003ctd\u003e0.29 cu ft *\u003c\/td\u003e\n\u003ctd\u003e12.40\" W x 11.75\" H x 6.60\/10.88\" D\u003c\/td\u003e\n\u003ctd\u003e0.640\u003c\/td\u003e\n\u003ctd\u003e61.2 Hz\u003c\/td\u003e\n\u003ctd\u003e68.2 Hz\u003c\/td\u003e\n\u003ctd\u003e69 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e10 L\u003c\/td\u003e\n\u003ctd\u003e0.35 cu ft\u003c\/td\u003e\n\u003ctd\u003e14.16\" W x 11.75\" H x 6.60\/10.88\" D\u003c\/td\u003e\n\u003ctd\u003e0.694\u003c\/td\u003e\n\u003ctd\u003e50.3 Hz\u003c\/td\u003e\n\u003ctd\u003e51.3 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft\u003c\/td\u003e\n\u003ctd\u003e29.50\" W x 11.75\" H x 6.65\/10.93\" D\u003c\/td\u003e\n\u003ctd\u003e0.695\u003c\/td\u003e\n\u003ctd\u003e38.2 Hz\u003c\/td\u003e\n\u003ctd\u003e38.9 Hz\u003c\/td\u003e\n\u003ctd\u003e39 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W8 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003cp\u003eMarked with an asterisk: at no added mass the IQ W8 wants less air than the smallest cabinet this chassis can build. The 0.29 cu ft figure listed is what we actually cut, which is 0.08 above Helix's figure, and the Qtc shown is the one that volume produces rather than the 0.70 they publish. The cost is about a hertz of F3 and a slightly drier alignment. We would rather print the number we build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W8\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W8 runs a system Qtc of \u003cstrong\u003e0.640 to 0.695\u003c\/strong\u003e with resonance from 38.2 to 61.2 Hz, on 0.29 to 0.88 cubic feet net. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.7 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 7.2100 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W8 needs 4.51 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IQ W8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils on one 63 mm former. In parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 750 watts RMS and does not change with the Tuning Mass setting. Aim for roughly 525 to 750 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the driver and the Tuning Mass weights that come with it are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W8: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.29 to 0.88 cubic feet net at Qtc 0.640 to 0.695, F3 38.9 to 68.2 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass \/ Black","offer_id":47754496704601,"sku":"PO 8-S W IQW8 TM0 BB","price":269.99,"currency_code":"USD","in_stock":true},{"title":"No Added Mass \/ None","offer_id":47754498900057,"sku":"PO 8-S W IQW8 TM0 B","price":249.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ Black","offer_id":47754498932825,"sku":"PO 8-S W IQW8 TM1 BB","price":289.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ None","offer_id":47754498965593,"sku":"PO 8-S W IQW8 TM1 B","price":269.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ Black","offer_id":47754498998361,"sku":"PO 8-S W IQW8 TM2 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ None","offer_id":47754499031129,"sku":"PO 8-S W IQW8 TM2 B","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8-S_W_IQW8_TM0_Front.jpg?v=1793938778"},{"product_id":"performance-optimized-down-fire-sealed-8-enclosure-helix-iq-w8","title":"Helix IQ W8 Box: Sealed 8\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IQ W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e8\" Sealed Down Fire Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.23 to 0.88 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.681 to 0.695\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.9 to 67.7 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IQ W8 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W8: a 222 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The same cone area as the IK S8 on more than four times the excursion and two and a half times the power. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 6 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.69 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e6 L\u003c\/td\u003e\n\u003ctd\u003e0.23 cu ft *\u003c\/td\u003e\n\u003ctd\u003e11.90\" W x 15\" D x 6.01\" H\u003c\/td\u003e\n\u003ctd\u003e0.681\u003c\/td\u003e\n\u003ctd\u003e65.0 Hz\u003c\/td\u003e\n\u003ctd\u003e67.7 Hz\u003c\/td\u003e\n\u003ctd\u003e69 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e10 L\u003c\/td\u003e\n\u003ctd\u003e0.35 cu ft\u003c\/td\u003e\n\u003ctd\u003e15.99\" W x 15\" D x 6.01\" H\u003c\/td\u003e\n\u003ctd\u003e0.694\u003c\/td\u003e\n\u003ctd\u003e50.3 Hz\u003c\/td\u003e\n\u003ctd\u003e51.3 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 6.56\" H\u003c\/td\u003e\n\u003ctd\u003e0.695\u003c\/td\u003e\n\u003ctd\u003e38.2 Hz\u003c\/td\u003e\n\u003ctd\u003e38.9 Hz\u003c\/td\u003e\n\u003ctd\u003e39 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W8 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003cp\u003eMarked with an asterisk: at no added mass the IQ W8 wants less air than the smallest cabinet this chassis can build. The 0.23 cu ft figure listed is what we actually cut, which is 0.02 above Helix's figure, and the Qtc shown is the one that volume produces rather than the 0.70 they publish. The cost is about a hertz of F3 and a slightly drier alignment. We would rather print the number we build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Some Of These Are Narrower\u003c\/h2\u003e\n\u003cp\u003eSome of these are narrower than the 30 inches a Proline X down fire normally runs: no added mass at 11.90 in, +1 mass ring at 15.99 in. That is deliberate. A 30 inch footprint holds more air than the lower Tuning Mass settings want, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular footprint, 11.90 to 30.00 inches wide by 15 deep, stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W8\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W8 runs a system Qtc of \u003cstrong\u003e0.681 to 0.695\u003c\/strong\u003e with resonance from 38.2 to 65.0 Hz, on 0.23 to 0.88 cubic feet net. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.7 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 7.2100 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W8 needs 4.51 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IQ W8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils on one 63 mm former. In parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 750 watts RMS and does not change with the Tuning Mass setting. Aim for roughly 525 to 750 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the driver and the Tuning Mass weights that come with it are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W8: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.23 to 0.88 cubic feet net at Qtc 0.681 to 0.695, F3 38.9 to 67.7 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass","offer_id":47754541301849,"sku":"PO 8-S DF IQW8 TM0","price":249.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring","offer_id":47754541334617,"sku":"PO 8-S DF IQW8 TM1","price":269.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings","offer_id":47754541367385,"sku":"PO 8-S DF IQW8 TM2","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8-S_DF_IQW8_TM0_Front.jpg?v=1793939868"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-helix-iq-w8","title":"Helix IQ W8 Dual Box: Sealed 8\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IQ W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 8\" Sealed Wedge Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.26 to 0.88 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.659 to 0.695\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.9 to 67.9 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IQ W8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W8: a 222 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The same cone area as the IK S8 on more than four times the excursion and two and a half times the power. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 6 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.69 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e6 L\u003c\/td\u003e\n\u003ctd\u003e0.26 cu ft per driver *\u003c\/td\u003e\n\u003ctd\u003e22.05\" W x 11\" H x 6.76\/10.76\" D\u003c\/td\u003e\n\u003ctd\u003e0.659\u003c\/td\u003e\n\u003ctd\u003e62.9 Hz\u003c\/td\u003e\n\u003ctd\u003e67.9 Hz\u003c\/td\u003e\n\u003ctd\u003e69 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e10 L\u003c\/td\u003e\n\u003ctd\u003e0.35 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e27.76\" W x 11\" H x 6.76\/10.76\" D\u003c\/td\u003e\n\u003ctd\u003e0.694\u003c\/td\u003e\n\u003ctd\u003e50.3 Hz\u003c\/td\u003e\n\u003ctd\u003e51.3 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e32.00\" W x 11\" H x 12.61\/16.62\" D\u003c\/td\u003e\n\u003ctd\u003e0.695\u003c\/td\u003e\n\u003ctd\u003e38.2 Hz\u003c\/td\u003e\n\u003ctd\u003e38.9 Hz\u003c\/td\u003e\n\u003ctd\u003e39 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W8 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003cp\u003eMarked with an asterisk: at no added mass the IQ W8 wants less air than the smallest cabinet this chassis can build. The 0.26 cu ft figure listed is what we actually cut, which is 0.05 above Helix's figure, and the Qtc shown is the one that volume produces rather than the 0.70 they publish. The cost is about a hertz of F3 and a slightly drier alignment. We would rather print the number we build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IQ W8 its own sealed chamber and its own polyfill, 0.31 to 0.94 cu ft gross each depending on the Tuning Mass setting. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W8\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W8 runs a system Qtc of \u003cstrong\u003e0.659 to 0.695\u003c\/strong\u003e with resonance from 38.2 to 62.9 Hz, on 0.26 to 0.88 cubic feet net per driver. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.7 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 7.2100 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W8 needs 4.51 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils per driver. Across a pair the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the two drivers in parallel. Both drivers must be wired identically, and any route to 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 1500 watts RMS total across the pair and does not change with the Tuning Mass setting. Aim for roughly 1050 to 1500 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the drivers and the Tuning Mass weights that come with them are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W8 Dual: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.26 to 0.88 cubic feet net per driver at Qtc 0.659 to 0.695, F3 38.9 to 67.9 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass \/ Black","offer_id":47754541432921,"sku":"PO 8D-S W IQW8 TM0 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"No Added Mass \/ None","offer_id":47754541465689,"sku":"PO 8D-S W IQW8 TM0 B","price":299.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ Black","offer_id":47754541498457,"sku":"PO 8D-S W IQW8 TM1 BB","price":344.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ None","offer_id":47754541531225,"sku":"PO 8D-S W IQW8 TM1 B","price":324.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ Black","offer_id":47754541563993,"sku":"PO 8D-S W IQW8 TM2 BB","price":374.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ None","offer_id":47754541596761,"sku":"PO 8D-S W IQW8 TM2 B","price":354.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_W_IQW8_TM0_Front.jpg?v=1793939891"},{"product_id":"performance-optimized-down-fire-sealed-dual-8-enclosure-helix-iq-w8","title":"Helix IQ W8 Dual Box: Sealed 8\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IQ W8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 8\" Sealed Down Fire Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.23 to 0.88 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.680 to 0.695\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.9 to 67.7 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IQ W8 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W8: a 222 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The same cone area as the IK S8 on more than four times the excursion and two and a half times the power. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 6 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.69 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e6 L\u003c\/td\u003e\n\u003ctd\u003e0.23 cu ft per driver *\u003c\/td\u003e\n\u003ctd\u003e21.55\" W x 15\" D x 6.01\" H\u003c\/td\u003e\n\u003ctd\u003e0.680\u003c\/td\u003e\n\u003ctd\u003e65.0 Hz\u003c\/td\u003e\n\u003ctd\u003e67.7 Hz\u003c\/td\u003e\n\u003ctd\u003e69 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e10 L\u003c\/td\u003e\n\u003ctd\u003e0.35 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e29.68\" W x 15\" D x 6.01\" H\u003c\/td\u003e\n\u003ctd\u003e0.694\u003c\/td\u003e\n\u003ctd\u003e50.3 Hz\u003c\/td\u003e\n\u003ctd\u003e51.3 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 11.03\" H\u003c\/td\u003e\n\u003ctd\u003e0.695\u003c\/td\u003e\n\u003ctd\u003e38.2 Hz\u003c\/td\u003e\n\u003ctd\u003e38.9 Hz\u003c\/td\u003e\n\u003ctd\u003e39 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W8 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003cp\u003eMarked with an asterisk: at no added mass the IQ W8 wants less air than the smallest cabinet this chassis can build. The 0.23 cu ft figure listed is what we actually cut, which is 0.02 above Helix's figure, and the Qtc shown is the one that volume produces rather than the 0.70 they publish. The cost is about a hertz of F3 and a slightly drier alignment. We would rather print the number we build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IQ W8 its own sealed chamber and its own polyfill, 0.28 to 0.94 cu ft gross each depending on the Tuning Mass setting. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Some Of These Are Narrower\u003c\/h2\u003e\n\u003cp\u003eSome of these are narrower than the 30 inches a Proline X down fire normally runs: no added mass at 21.55 in, +1 mass ring at 29.68 in. That is deliberate. A 30 inch footprint holds more air than the lower Tuning Mass settings want, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular footprint, 21.55 to 30.00 inches wide by 15 deep, stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W8\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W8 runs a system Qtc of \u003cstrong\u003e0.680 to 0.695\u003c\/strong\u003e with resonance from 38.2 to 65.0 Hz, on 0.23 to 0.88 cubic feet net per driver. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.7 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 7.2100 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W8 needs 4.51 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils per driver. Across a pair the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the two drivers in parallel. Both drivers must be wired identically, and any route to 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 1500 watts RMS total across the pair and does not change with the Tuning Mass setting. Aim for roughly 1050 to 1500 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the drivers and the Tuning Mass weights that come with them are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W8 Dual: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.23 to 0.88 cubic feet net per driver at Qtc 0.680 to 0.695, F3 38.9 to 67.7 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass","offer_id":47754541695065,"sku":"PO 8D-S DF IQW8 TM0","price":309.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring","offer_id":47754541826137,"sku":"PO 8D-S DF IQW8 TM1","price":334.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings","offer_id":47754541858905,"sku":"PO 8D-S DF IQW8 TM2","price":364.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_IQW8_TM0_Front.jpg?v=1793939914"},{"product_id":"performance-optimized-wedge-sealed-10-enclosure-helix-iq-w10","title":"Helix IQ W10 Box: Sealed 10\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IQ W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e10\" Sealed Wedge Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.46 to 0.88 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.695 to 0.746\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.7 to 62.5 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IQ W10 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W10: a 363 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The flagship ten of the Helix sealed range. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 13 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.75 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e13 L\u003c\/td\u003e\n\u003ctd\u003e0.46 cu ft\u003c\/td\u003e\n\u003ctd\u003e14.49\" W x 13\" H x 7.14\/11.87\" D\u003c\/td\u003e\n\u003ctd\u003e0.695\u003c\/td\u003e\n\u003ctd\u003e61.5 Hz\u003c\/td\u003e\n\u003ctd\u003e62.5 Hz\u003c\/td\u003e\n\u003ctd\u003e65 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e19 L\u003c\/td\u003e\n\u003ctd\u003e0.67 cu ft\u003c\/td\u003e\n\u003ctd\u003e19.38\" W x 13\" H x 7.14\/11.87\" D\u003c\/td\u003e\n\u003ctd\u003e0.696\u003c\/td\u003e\n\u003ctd\u003e49.3 Hz\u003c\/td\u003e\n\u003ctd\u003e50.1 Hz\u003c\/td\u003e\n\u003ctd\u003e52 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft\u003c\/td\u003e\n\u003ctd\u003e24.28\" W x 13\" H x 7.14\/11.87\" D\u003c\/td\u003e\n\u003ctd\u003e0.746\u003c\/td\u003e\n\u003ctd\u003e40.7 Hz\u003c\/td\u003e\n\u003ctd\u003e38.7 Hz\u003c\/td\u003e\n\u003ctd\u003e40 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W10 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W10\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W10 runs a system Qtc of \u003cstrong\u003e0.695 to 0.746\u003c\/strong\u003e with resonance from 40.7 to 61.5 Hz, on 0.46 to 0.88 cubic feet net. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 2.5 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 9.2400 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W10 needs 5.30 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IQ W10 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils on one 63 mm former. In parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 750 watts RMS and does not change with the Tuning Mass setting. Aim for roughly 525 to 750 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the driver and the Tuning Mass weights that come with it are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W10: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.46 to 0.88 cubic feet net at Qtc 0.695 to 0.746, F3 38.7 to 62.5 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass \/ Black","offer_id":47754541924441,"sku":"PO 10-S W IQW10 TM0 BB","price":289.99,"currency_code":"USD","in_stock":true},{"title":"No Added Mass \/ None","offer_id":47754541957209,"sku":"PO 10-S W IQW10 TM0 B","price":269.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ Black","offer_id":47754541989977,"sku":"PO 10-S W IQW10 TM1 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ None","offer_id":47754542022745,"sku":"PO 10-S W IQW10 TM1 B","price":299.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ Black","offer_id":47754542055513,"sku":"PO 10-S W IQW10 TM2 BB","price":359.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ None","offer_id":47754542088281,"sku":"PO 10-S W IQW10 TM2 B","price":339.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10-S_W_IQW10_TM0_Front.jpg?v=1793939937"},{"product_id":"performance-optimized-down-fire-sealed-10-enclosure-helix-iq-w10","title":"Helix IQ W10 Box: Sealed 10\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IQ W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e10\" Sealed Down Fire Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.46 to 0.88 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.695 to 0.746\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.7 to 62.5 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IQ W10 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W10: a 363 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The flagship ten of the Helix sealed range. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 13 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.75 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e13 L\u003c\/td\u003e\n\u003ctd\u003e0.46 cu ft\u003c\/td\u003e\n\u003ctd\u003e17.07\" W x 15\" D x 6.80\" H\u003c\/td\u003e\n\u003ctd\u003e0.695\u003c\/td\u003e\n\u003ctd\u003e61.5 Hz\u003c\/td\u003e\n\u003ctd\u003e62.5 Hz\u003c\/td\u003e\n\u003ctd\u003e65 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e19 L\u003c\/td\u003e\n\u003ctd\u003e0.67 cu ft\u003c\/td\u003e\n\u003ctd\u003e23.03\" W x 15\" D x 6.80\" H\u003c\/td\u003e\n\u003ctd\u003e0.696\u003c\/td\u003e\n\u003ctd\u003e49.3 Hz\u003c\/td\u003e\n\u003ctd\u003e50.1 Hz\u003c\/td\u003e\n\u003ctd\u003e52 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft\u003c\/td\u003e\n\u003ctd\u003e28.99\" W x 15\" D x 6.80\" H\u003c\/td\u003e\n\u003ctd\u003e0.746\u003c\/td\u003e\n\u003ctd\u003e40.7 Hz\u003c\/td\u003e\n\u003ctd\u003e38.7 Hz\u003c\/td\u003e\n\u003ctd\u003e40 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W10 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Some Of These Are Narrower\u003c\/h2\u003e\n\u003cp\u003eSome of these are narrower than the 30 inches a Proline X down fire normally runs: no added mass at 17.07 in, +1 mass ring at 23.03 in, +2 mass rings at 28.99 in. That is deliberate. A 30 inch footprint holds more air than the lower Tuning Mass settings want, and a sealed driver in too much air loses damping rather than gaining depth, so the cabinet is cut narrower to land on Helix's volume.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular footprint, 17.07 to 28.99 inches wide by 15 deep, stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W10\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W10 runs a system Qtc of \u003cstrong\u003e0.695 to 0.746\u003c\/strong\u003e with resonance from 40.7 to 61.5 Hz, on 0.46 to 0.88 cubic feet net. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 2.5 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 9.2400 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W10 needs 5.30 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IQ W10 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils on one 63 mm former. In parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 750 watts RMS and does not change with the Tuning Mass setting. Aim for roughly 525 to 750 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the driver and the Tuning Mass weights that come with it are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W10: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.46 to 0.88 cubic feet net at Qtc 0.695 to 0.746, F3 38.7 to 62.5 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass","offer_id":47754542186585,"sku":"PO 10-S DF IQW10 TM0","price":279.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring","offer_id":47754542645337,"sku":"PO 10-S DF IQW10 TM1","price":309.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings","offer_id":47754542678105,"sku":"PO 10-S DF IQW10 TM2","price":349.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10-S_DF_IQW10_TM0_Front.jpg?v=1793939960"},{"product_id":"performance-optimized-wedge-sealed-dual-10-enclosure-helix-iq-w10","title":"Helix IQ W10 Dual Box: Sealed 10\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IQ W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 10\" Sealed Wedge Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.52 to 0.88 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.669 to 0.746\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.7 to 62.7 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IQ W10 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W10: a 363 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The flagship ten of the Helix sealed range. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 13 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.75 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e13 L\u003c\/td\u003e\n\u003ctd\u003e0.52 cu ft per driver *\u003c\/td\u003e\n\u003ctd\u003e25.91\" W x 15\" H x 6.74\/12.20\" D\u003c\/td\u003e\n\u003ctd\u003e0.669\u003c\/td\u003e\n\u003ctd\u003e59.1 Hz\u003c\/td\u003e\n\u003ctd\u003e62.7 Hz\u003c\/td\u003e\n\u003ctd\u003e65 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e19 L\u003c\/td\u003e\n\u003ctd\u003e0.67 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e31.77\" W x 15\" H x 6.74\/12.20\" D\u003c\/td\u003e\n\u003ctd\u003e0.696\u003c\/td\u003e\n\u003ctd\u003e49.3 Hz\u003c\/td\u003e\n\u003ctd\u003e50.1 Hz\u003c\/td\u003e\n\u003ctd\u003e52 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e32.00\" W x 15\" H x 8.58\/14.04\" D\u003c\/td\u003e\n\u003ctd\u003e0.746\u003c\/td\u003e\n\u003ctd\u003e40.7 Hz\u003c\/td\u003e\n\u003ctd\u003e38.7 Hz\u003c\/td\u003e\n\u003ctd\u003e40 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W10 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003cp\u003eMarked with an asterisk: at no added mass the IQ W10 wants less air than the smallest cabinet this chassis can build. The 0.52 cu ft figure listed is what we actually cut, which is 0.06 above Helix's figure, and the Qtc shown is the one that volume produces rather than the 0.70 they publish. The cost is about a hertz of F3 and a slightly drier alignment. We would rather print the number we build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IQ W10 its own sealed chamber and its own polyfill, 0.59 to 0.96 cu ft gross each depending on the Tuning Mass setting. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W10\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W10 runs a system Qtc of \u003cstrong\u003e0.669 to 0.746\u003c\/strong\u003e with resonance from 40.7 to 59.1 Hz, on 0.52 to 0.88 cubic feet net per driver. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 2.3 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 9.2400 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W10 needs 5.30 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils per driver. Across a pair the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the two drivers in parallel. Both drivers must be wired identically, and any route to 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 1500 watts RMS total across the pair and does not change with the Tuning Mass setting. Aim for roughly 1050 to 1500 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the drivers and the Tuning Mass weights that come with them are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W10 Dual: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.52 to 0.88 cubic feet net per driver at Qtc 0.669 to 0.746, F3 38.7 to 62.7 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass \/ Black","offer_id":47754542743641,"sku":"PO 10D-S W IQW10 TM0 BB","price":399.99,"currency_code":"USD","in_stock":true},{"title":"No Added Mass \/ None","offer_id":47754542776409,"sku":"PO 10D-S W IQW10 TM0 B","price":379.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ Black","offer_id":47754542809177,"sku":"PO 10D-S W IQW10 TM1 BB","price":429.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ None","offer_id":47754542841945,"sku":"PO 10D-S W IQW10 TM1 B","price":409.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ Black","offer_id":47754542874713,"sku":"PO 10D-S W IQW10 TM2 BB","price":469.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ None","offer_id":47754542907481,"sku":"PO 10D-S W IQW10 TM2 B","price":449.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10D-S_W_IQW10_TM0_Front.jpg?v=1793939983"},{"product_id":"performance-optimized-down-fire-sealed-dual-10-enclosure-helix-iq-w10","title":"Helix IQ W10 Dual Box: Sealed 10\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IQ W10\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 10\" Sealed Down Fire Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e0.46 to 0.88 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.695 to 0.746\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 38.7 to 62.5 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IQ W10 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W10: a 363 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel. The flagship ten of the Helix sealed range. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 13 to 25 litres of Helix's own recommended volume, and across those the system Q works out at 0.70 at the base setting and 0.75 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e13 L\u003c\/td\u003e\n\u003ctd\u003e0.46 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 7.12\" H\u003c\/td\u003e\n\u003ctd\u003e0.695\u003c\/td\u003e\n\u003ctd\u003e61.5 Hz\u003c\/td\u003e\n\u003ctd\u003e62.5 Hz\u003c\/td\u003e\n\u003ctd\u003e65 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e19 L\u003c\/td\u003e\n\u003ctd\u003e0.67 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 9.15\" H\u003c\/td\u003e\n\u003ctd\u003e0.696\u003c\/td\u003e\n\u003ctd\u003e49.3 Hz\u003c\/td\u003e\n\u003ctd\u003e50.1 Hz\u003c\/td\u003e\n\u003ctd\u003e52 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e25 L\u003c\/td\u003e\n\u003ctd\u003e0.88 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 11.18\" H\u003c\/td\u003e\n\u003ctd\u003e0.746\u003c\/td\u003e\n\u003ctd\u003e40.7 Hz\u003c\/td\u003e\n\u003ctd\u003e38.7 Hz\u003c\/td\u003e\n\u003ctd\u003e40 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W10 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IQ W10 its own sealed chamber and its own polyfill, 0.52 to 0.96 cu ft gross each depending on the Tuning Mass setting. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular footprint, 30.00 inches wide by 15 deep, stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W10\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W10 runs a system Qtc of \u003cstrong\u003e0.695 to 0.746\u003c\/strong\u003e with resonance from 40.7 to 61.5 Hz, on 0.46 to 0.88 cubic feet net per driver. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 2.5 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 9.2400 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W10 needs 5.30 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils per driver. Across a pair the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the two drivers in parallel. Both drivers must be wired identically, and any route to 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 1500 watts RMS total across the pair and does not change with the Tuning Mass setting. Aim for roughly 1050 to 1500 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the drivers and the Tuning Mass weights that come with them are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W10 Dual: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e0.46 to 0.88 cubic feet net per driver at Qtc 0.695 to 0.746, F3 38.7 to 62.5 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass","offer_id":47754543005785,"sku":"PO 10D-S DF IQW10 TM0","price":309.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring","offer_id":47754543202393,"sku":"PO 10D-S DF IQW10 TM1","price":339.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings","offer_id":47754543235161,"sku":"PO 10D-S DF IQW10 TM2","price":379.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10D-S_DF_IQW10_TM0_Front.jpg?v=1793940005"},{"product_id":"performance-optimized-wedge-sealed-12-enclosure-helix-iq-w12","title":"Helix IQ W12 Box: Sealed 12\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IQ W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e12\" Sealed Wedge Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e1.17 to 2.30 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.689 to 0.707\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 36.0 to 53.1 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IQ W12 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W12: a 515 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel, and the widest Tuning Mass span in the line, 33 litres at the base setting to 115 at plus three. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 33 to 65 litres of Helix's own recommended volume, and across those the system Q works out at 0.69 at the base setting and 0.71 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e33 L\u003c\/td\u003e\n\u003ctd\u003e1.17 cu ft\u003c\/td\u003e\n\u003ctd\u003e25.90\" W x 15\" H x 7.14\/12.60\" D\u003c\/td\u003e\n\u003ctd\u003e0.689\u003c\/td\u003e\n\u003ctd\u003e51.7 Hz\u003c\/td\u003e\n\u003ctd\u003e53.1 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e47 L\u003c\/td\u003e\n\u003ctd\u003e1.66 cu ft\u003c\/td\u003e\n\u003ctd\u003e29.50\" W x 15\" H x 8.57\/14.03\" D\u003c\/td\u003e\n\u003ctd\u003e0.700\u003c\/td\u003e\n\u003ctd\u003e42.3 Hz\u003c\/td\u003e\n\u003ctd\u003e42.7 Hz\u003c\/td\u003e\n\u003ctd\u003e44 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e65 L\u003c\/td\u003e\n\u003ctd\u003e2.30 cu ft\u003c\/td\u003e\n\u003ctd\u003e29.50\" W x 15\" H x 11.60\/17.06\" D\u003c\/td\u003e\n\u003ctd\u003e0.707\u003c\/td\u003e\n\u003ctd\u003e36.0 Hz\u003c\/td\u003e\n\u003ctd\u003e36.0 Hz\u003c\/td\u003e\n\u003ctd\u003e37 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W12 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe driver mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofer\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cone firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W12\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W12 runs a system Qtc of \u003cstrong\u003e0.689 to 0.707\u003c\/strong\u003e with resonance from 36.0 to 51.7 Hz, on 1.17 to 2.30 cubic feet net. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.3 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 11.0600 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W12 needs 5.70 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IQ W12 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils on one 63 mm former. In parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 750 watts RMS and does not change with the Tuning Mass setting. Aim for roughly 525 to 750 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the driver and the Tuning Mass weights that come with it are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W12: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e1.17 to 2.30 cubic feet net at Qtc 0.689 to 0.707, F3 36.0 to 53.1 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass \/ Black","offer_id":47754543366233,"sku":"PO 12-S W IQW12 TM0 BB","price":369.99,"currency_code":"USD","in_stock":true},{"title":"No Added Mass \/ None","offer_id":47754543464537,"sku":"PO 12-S W IQW12 TM0 B","price":349.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ Black","offer_id":47754543497305,"sku":"PO 12-S W IQW12 TM1 BB","price":399.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ None","offer_id":47754543530073,"sku":"PO 12-S W IQW12 TM1 B","price":379.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ Black","offer_id":47754543562841,"sku":"PO 12-S W IQW12 TM2 BB","price":449.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ None","offer_id":47754543595609,"sku":"PO 12-S W IQW12 TM2 B","price":429.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12-S_W_IQW12_TM0_Front.jpg?v=1793940028"},{"product_id":"performance-optimized-down-fire-sealed-12-enclosure-helix-iq-w12","title":"Helix IQ W12 Box: Sealed 12\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IQ W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003e12\" Sealed Down Fire Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e1.17 to 2.30 ft3 Net\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.689 to 0.707\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eSingle Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 36.0 to 53.1 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThe Helix IQ W12 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W12: a 515 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel, and the widest Tuning Mass span in the line, 33 litres at the base setting to 115 at plus three. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 33 to 65 litres of Helix's own recommended volume, and across those the system Q works out at 0.69 at the base setting and 0.71 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e33 L\u003c\/td\u003e\n\u003ctd\u003e1.17 cu ft\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 8.09\" H\u003c\/td\u003e\n\u003ctd\u003e0.689\u003c\/td\u003e\n\u003ctd\u003e51.7 Hz\u003c\/td\u003e\n\u003ctd\u003e53.1 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e47 L\u003c\/td\u003e\n\u003ctd\u003e1.66 cu ft\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 10.40\" H\u003c\/td\u003e\n\u003ctd\u003e0.700\u003c\/td\u003e\n\u003ctd\u003e42.3 Hz\u003c\/td\u003e\n\u003ctd\u003e42.7 Hz\u003c\/td\u003e\n\u003ctd\u003e44 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e65 L\u003c\/td\u003e\n\u003ctd\u003e2.30 cu ft\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 13.37\" H\u003c\/td\u003e\n\u003ctd\u003e0.707\u003c\/td\u003e\n\u003ctd\u003e36.0 Hz\u003c\/td\u003e\n\u003ctd\u003e36.0 Hz\u003c\/td\u003e\n\u003ctd\u003e37 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W12 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cone facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCone Fires Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular footprint, 30.00 inches wide by 15 deep, stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W12\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W12 runs a system Qtc of \u003cstrong\u003e0.689 to 0.707\u003c\/strong\u003e with resonance from 36.0 to 51.7 Hz, on 1.17 to 2.30 cubic feet net. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.3 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is CNC cut to 11.0600 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W12 needs 5.70 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and brace seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to the driver position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Helix IQ W12 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils on one 63 mm former. In parallel that is \u003cstrong\u003e1 ohm\u003c\/strong\u003e, in series \u003cstrong\u003e4 ohms\u003c\/strong\u003e. Pick the one your amplifier is rated for, and note that 1 ohm needs an amplifier that says so.\u003c\/p\u003e\n\u003cp\u003ePower handling is 750 watts RMS and does not change with the Tuning Mass setting. Aim for roughly 525 to 750 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the driver and the Tuning Mass weights that come with it are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W12: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e1.17 to 2.30 cubic feet net at Qtc 0.689 to 0.707, F3 36.0 to 53.1 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass","offer_id":47754543726681,"sku":"PO 12-S DF IQW12 TM0","price":289.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring","offer_id":47754544283737,"sku":"PO 12-S DF IQW12 TM1","price":319.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings","offer_id":47754544316505,"sku":"PO 12-S DF IQW12 TM2","price":369.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12-S_DF_IQW12_TM0_Front.jpg?v=1793940050"},{"product_id":"performance-optimized-wedge-sealed-dual-12-enclosure-helix-iq-w12","title":"Helix IQ W12 Dual Box: Sealed 12\" Wedge Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Helix IQ W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 12\" Sealed Wedge Enclosure | 3 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e1.17 to 2.30 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e3 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.689 to 0.707\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 36.0 to 53.1 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IQ W12 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W12: a 515 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel, and the widest Tuning Mass span in the line, 33 litres at the base setting to 115 at plus three. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass, +1 mass ring and +2 mass rings, 33 to 65 litres of Helix's own recommended volume, and across those the system Q works out at 0.69 at the base setting and 0.71 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eThree Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e33 L\u003c\/td\u003e\n\u003ctd\u003e1.17 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e32.00\" W x 16\" H x 10.41\/16.24\" D\u003c\/td\u003e\n\u003ctd\u003e0.689\u003c\/td\u003e\n\u003ctd\u003e51.7 Hz\u003c\/td\u003e\n\u003ctd\u003e53.1 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e47 L\u003c\/td\u003e\n\u003ctd\u003e1.66 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e32.00\" W x 16\" H x 14.51\/20.34\" D\u003c\/td\u003e\n\u003ctd\u003e0.700\u003c\/td\u003e\n\u003ctd\u003e42.3 Hz\u003c\/td\u003e\n\u003ctd\u003e42.7 Hz\u003c\/td\u003e\n\u003ctd\u003e44 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+2 Mass Rings\u003c\/td\u003e\n\u003ctd\u003e65 L\u003c\/td\u003e\n\u003ctd\u003e2.30 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e32.00\" W x 16\" H x 19.78\/25.60\" D\u003c\/td\u003e\n\u003ctd\u003e0.707\u003c\/td\u003e\n\u003ctd\u003e36.0 Hz\u003c\/td\u003e\n\u003ctd\u003e36.0 Hz\u003c\/td\u003e\n\u003ctd\u003e37 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W12 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IQ W12 its own sealed chamber and its own polyfill, 1.28 to 2.44 cu ft gross each depending on the Tuning Mass setting. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTrunk-Load Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThe drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eSeat-Side Face Matches Seat Lean\u003c\/h4\u003e\n\u003cp\u003eAngled face matches the roughly 20 degree factory seat lean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk-Lid-Side Face Fires the Woofers\u003c\/h4\u003e\n\u003cp\u003eVertical baffle, cones firing rearward into the trunk cavity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eTrunk Cavity Loading\u003c\/h4\u003e\n\u003cp\u003eThe trunk acts as an acoustic extension for a smoother presentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePreserves Trunk Cargo Space\u003c\/h4\u003e\n\u003cp\u003eThe wedge tucks against the seat back and the space in front stays usable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W12\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W12 runs a system Qtc of \u003cstrong\u003e0.689 to 0.707\u003c\/strong\u003e with resonance from 36.0 to 51.7 Hz, on 1.17 to 2.30 cubic feet net per driver. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.3 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 11.0600 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W12 needs 5.70 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils per driver. Across a pair the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the two drivers in parallel. Both drivers must be wired identically, and any route to 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 1500 watts RMS total across the pair and does not change with the Tuning Mass setting. Aim for roughly 1050 to 1500 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the drivers and the Tuning Mass weights that come with them are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W12 Dual: One Driver, Three Alignments\u003c\/h2\u003e\n\u003cp\u003e1.17 to 2.30 cubic feet net per driver at Qtc 0.689 to 0.707, F3 36.0 to 53.1 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass \/ Black","offer_id":47754544349273,"sku":"PO 12D-S W IQW12 TM0 BB","price":419.99,"currency_code":"USD","in_stock":true},{"title":"No Added Mass \/ None","offer_id":47754544447577,"sku":"PO 12D-S W IQW12 TM0 B","price":399.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ Black","offer_id":47754544480345,"sku":"PO 12D-S W IQW12 TM1 BB","price":459.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring \/ None","offer_id":47754544513113,"sku":"PO 12D-S W IQW12 TM1 B","price":439.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ Black","offer_id":47754544545881,"sku":"PO 12D-S W IQW12 TM2 BB","price":509.99,"currency_code":"USD","in_stock":true},{"title":"+2 Mass Rings \/ None","offer_id":47754544578649,"sku":"PO 12D-S W IQW12 TM2 B","price":489.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12D-S_W_IQW12_TM0_Front.jpg?v=1793940070"},{"product_id":"performance-optimized-down-fire-sealed-dual-12-enclosure-helix-iq-w12","title":"Helix IQ W12 Dual Box: Sealed 12\" Down Fire Enclosure","description":"\u003cdiv class=\"po-wrap\"\u003e\n\u003cstyle\u003e\n.po-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.8;color:#1e293b;max-width:1200px;margin:0 auto;background:#fff}\n.po-hero{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-hero .po-title{font-size:2.6em;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin:0 0 10px 0;color:#fff}\n.po-hero .po-subtitle{font-size:1.2em;font-weight:300;opacity:.9;margin:0 0 30px 0}\n.po-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:20px}\n.po-badge{background:rgba(184,115,51,.2);border:1px solid #b87333;color:#d99058;padding:8px 20px;border-radius:20px;font-size:.9em;font-weight:600;letter-spacing:.5px}\n.po-section{padding:50px 40px;border-bottom:1px solid #e2e8f0;background:#fff}\n.po-section:nth-child(even){background:#fef3e7}\n.po-section h2{color:#8b5a2b;font-size:2em;font-weight:700;margin:0 0 20px 0;padding-bottom:12px;border-bottom:3px solid #b87333}\n.po-section h3{color:#0f172a;font-size:1.4em;font-weight:600;margin:30px 0 15px 0}\n.po-section p{font-size:1.05em;color:#334155;margin-bottom:18px}\n.po-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:30px 0}\n.po-card{background:#fff;border:1px solid #e2e8f0;border-top:4px solid #b87333;padding:25px;border-radius:4px}\n.po-card h4{color:#8b5a2b;font-size:1.15em;font-weight:700;margin:0 0 12px 0;text-transform:uppercase;letter-spacing:1px}\n.po-card p{font-size:.98em;color:#475569;margin:0}\n.po-highlight{background:#fef3e7;border-left:4px solid #b87333;padding:25px 30px;margin:30px 0;border-radius:4px}\n.po-highlight p{color:#1e293b;margin:0;font-size:1.05em}\n.po-cta{background:linear-gradient(135deg,#0f172a 0%,#8b5a2b 100%);padding:60px 40px;text-align:center;color:#fff}\n.po-cta h2{font-size:2.2em;font-weight:700;margin:0 0 20px 0;color:#fff;border:none;padding:0}\n.po-cta p{font-size:1.15em;opacity:.92;max-width:800px;margin:0 auto 20px auto;color:#fff}\n@media (max-width:768px){.po-hero{padding:40px 20px}.po-hero .po-title{font-size:1.8em}.po-section{padding:30px 20px}.po-section h2{font-size:1.6em}.po-grid{grid-template-columns:1fr}.po-cta{padding:40px 20px}.po-cta h2{font-size:1.6em}}\n\u003c\/style\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Down Fire | Helix IQ W12\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 12\" Sealed Down Fire Enclosure | 2 Tuning Mass Sizes | Cut and Built to Order\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e1.17 to 1.66 ft3 Net Per Driver\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e2 Tuning Mass Sizes\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.689 to 0.700\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eDual Chamber Down Fire\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eF3 42.7 to 53.1 Hz\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eBuilt to Order in Tennessee\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Helix IQ W12 in a Sealed Down Fire\u003c\/h2\u003e\n\u003cp\u003eHelix's IQ W12: a 515 square centimeter cone on a 63 mm dual 2 ohm coil, 750 watts RMS and 12 mm of one-way travel, and the widest Tuning Mass span in the line, 33 litres at the base setting to 115 at plus three. The alignment below is computed from Helix's published Thiele-Small parameters, one set per Tuning Mass setting.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eThe IQ series carries Helix's Tuning Mass System: bolt-on weights that thread onto the cone assembly and let one driver run several alignments. Each weight raises moving mass, which drops free-air resonance and raises the driver's total Q, and Helix publishes a different recommended sealed volume for every setting to keep the system in hand. This cabinet is offered in no added mass and +1 mass ring, 33 to 47 litres of Helix's own recommended volume, and across those the system Q works out at 0.69 at the base setting and 0.70 at the top of the range offered. What does not change is compliance, and therefore Vas, because mass and spring rate are independent.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Cabinets, One Listing\u003c\/h2\u003e\n\u003cp\u003eEvery one of these is cut and built to order. Nothing is pre-cut and nothing sits on a shelf waiting for a Tuning Mass setting to be chosen, because each setting is a different cabinet rather than a label on one. Pick the setting you intend to run and the panels are cut to it.\u003c\/p\u003e\n\u003ctable class=\"ps-specs-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eTuning Mass\u003c\/th\u003e\n\u003cth\u003eHelix volume\u003c\/th\u003e\n\u003cth\u003eNet built\u003c\/th\u003e\n\u003cth\u003eExternal\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3 anechoic\u003c\/th\u003e\n\u003cth\u003eHelix F3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo Added Mass\u003c\/td\u003e\n\u003ctd\u003e33 L\u003c\/td\u003e\n\u003ctd\u003e1.17 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 14.17\" H\u003c\/td\u003e\n\u003ctd\u003e0.689\u003c\/td\u003e\n\u003ctd\u003e51.7 Hz\u003c\/td\u003e\n\u003ctd\u003e53.1 Hz\u003c\/td\u003e\n\u003ctd\u003e53 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+1 Mass Ring\u003c\/td\u003e\n\u003ctd\u003e47 L\u003c\/td\u003e\n\u003ctd\u003e1.66 cu ft per driver\u003c\/td\u003e\n\u003ctd\u003e30.00\" W x 15\" D x 18.90\" H\u003c\/td\u003e\n\u003ctd\u003e0.700\u003c\/td\u003e\n\u003ctd\u003e42.3 Hz\u003c\/td\u003e\n\u003ctd\u003e42.7 Hz\u003c\/td\u003e\n\u003ctd\u003e44 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose the setting on this page and the cabinet is cut to it. Pricing follows the cabinet, so the settings are not all the same price.\u003c\/p\u003e\n\u003cp\u003eThe IQ W12 ships with three weights. The top setting, all three fitted, is not offered as a listed size here; call or text 931-563-5151 if that is the alignment you want and we will quote the cabinet for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eTwo Fully Separate Chambers\u003c\/h2\u003e\n\u003cp\u003eA full bonded 3\/4 inch MDF divider gives each IQ W12 its own sealed chamber and its own polyfill, 1.28 to 1.79 cu ft gross each depending on the Tuning Mass setting. Two drivers sharing one volume interact acoustically, each cone's compression stroke becoming the pressure the other works against. A divider removes that entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy One Setting Is Missing\u003c\/h2\u003e\n\u003cp\u003eThe plus 2 setting is not offered in this chassis, because the air will not fit inside dimensions we are willing to ship. Plus 2 asks for 65 litres, which would need 25.0 inches of down-fire height, or 23.0 on the wide floor, and is available as a single wedge, a single down fire or a dual wedge. The settings in the table above are unaffected.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhy Down Fire\u003c\/h2\u003e\n\u003cp\u003eA down fire cabinet sits flat on the trunk or cargo floor with the cones facing down, which keeps the top surface usable and puts the enclosure where a wedge cannot go. It is the answer when there is no rear seat back to lean against, when the load floor has to stay flat, or when the build is a truck rather than a sedan trunk.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCones Fire Downward\u003c\/h4\u003e\n\u003cp\u003eThe floor becomes the first reflecting surface, which loads the cabin evenly rather than aiming at one seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFeet Ship Uninstalled\u003c\/h4\u003e\n\u003cp\u003eMount them to suit your floor, or leave them off and run the cabinet front firing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlat Top, Usable Space\u003c\/h4\u003e\n\u003cp\u003eA rectangular footprint, 30.00 inches wide by 15 deep, stacks and straps in a way a wedge cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eFlush Recess Baffle\u003c\/h4\u003e\n\u003cp\u003eThe outer 3\/4 inch layer is machined as a recess so the driver bolts to the inner layer, recovering 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eEngineered for the Helix IQ W12\u003c\/h2\u003e\n\u003cp\u003eAcross the settings offered here the Helix IQ W12 runs a system Qtc of \u003cstrong\u003e0.689 to 0.700\u003c\/strong\u003e with resonance from 42.3 to 51.7 Hz, on 1.17 to 1.66 cubic feet net per driver. Every figure is Helix's own recommended sealed volume for that setting unless the table marks otherwise.\u003c\/p\u003e\n\u003ch3\u003eOn The F3 Figures\u003c\/h3\u003e\n\u003cp\u003eHelix prints a lower limiting frequency for every Tuning Mass setting, and ours agree with theirs to within 1.3 Hz at every setting offered here. That is worth stating because it is not true of every Helix line. The IK datasheets quote their figure with a recommended DSP highpass applied and read several hertz optimistic against the raw sealed response; the IQ sheets carry no filter recommendation and their numbers reconcile with the anechoic math. Both F3 columns in the table above are anechoic and exclude cabin gain.\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eBoth positions are CNC cut to 11.0600 in and identical at every setting, because the Tuning Mass weights change the cone assembly rather than the frame. The IQ W12 needs 5.70 in of mounting depth and every cabinet here clears it. Threaded inserts pressed into the baffle backside at every mounting location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003ePerformance Series Construction, Driver-Specific Tuning\u003c\/h2\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eLangboard Elite MDF\u003c\/h4\u003e\n\u003cp\u003ePremium 3\/4 in MDF throughout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eV-Groove and Dado Joinery\u003c\/h4\u003e\n\u003cp\u003eCNC cut V-grooves at every panel intersection, sides and divider seated in dados.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003ePre-Wired Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite, 12 gauge OFC pre-wired to both driver positions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring the Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe IQ series ships in one coil version, the DVC2: two 2 ohm coils per driver. Across a pair the sensible target is \u003cstrong\u003e2 ohms\u003c\/strong\u003e, reached by wiring each driver's coils in series for 4 ohms and then the two drivers in parallel. Both drivers must be wired identically, and any route to 1 ohm needs an amplifier rated for it.\u003c\/p\u003e\n\u003cp\u003ePower handling is 1500 watts RMS total across the pair and does not change with the Tuning Mass setting. Aim for roughly 1050 to 1500 watts at the impedance you wire to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBuilt in Tennessee, Backed by Audio Intensity\u003c\/h2\u003e\n\u003cp\u003eCut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet. 1 year limited warranty. Enclosure only: the drivers and the Tuning Mass weights that come with them are purchased separately. Call or text 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eHelix IQ W12 Dual: One Driver, Two Alignments\u003c\/h2\u003e\n\u003cp\u003e1.17 to 1.66 cubic feet net per driver at Qtc 0.689 to 0.700, F3 42.7 to 53.1 Hz anechoic, cut to your chosen Tuning Mass setting and built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"No Added Mass","offer_id":47754544644185,"sku":"PO 12D-S DF IQW12 TM0","price":399.99,"currency_code":"USD","in_stock":true},{"title":"+1 Mass Ring","offer_id":47754545692761,"sku":"PO 12D-S DF IQW12 TM1","price":469.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12D-S_DF_IQW12_TM0_Front.jpg?v=1793940090"}],"url":"https:\/\/audiointensity.com\/collections\/helix-subwoofer-enclosures.oembed","provider":"Audio Intensity","version":"1.0","type":"link"}