{"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","url":"https:\/\/audiointensity.com\/products\/performance-optimized-down-fire-sealed-10-enclosure-helix-iq-w10","provider":"Audio Intensity","version":"1.0","type":"link"}