{"title":"Dual 8 Inch Subwoofer Boxes","description":"\u003cdiv class=\"ai-collection-block\"\u003e\n\u003cp\u003eTwo eights move roughly the cone area of one twelve in a cabinet shallow enough for a regular-cab truck or a small trunk. It is the dual size people pick when depth, not width, is the constraint.\u003c\/p\u003e\n\u003cp\u003eEvery cabinet here holds two 8 inch drivers. The driver-matched cabinets are cut to the parameters of the driver they name, and the universal cabinets take any pair that clears their cutout and depth. Each listing says whether the pair shares one chamber or gets one each, and gives the net volume for the whole box.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"proline-x-p8d-s-dual-8-sealed-subwoofer-enclosure-v3","title":"Proline X P8D-S | Dual 8\" Sealed Subwoofer Enclosure | V3","description":"\u003cstyle\u003e\n .px-desc {\n font-family: 'Helvetica Neue', Arial, sans-serif;\n line-height: 1.8;\n color: #1e293b;\n max-width: 1200px;\n margin: 0 auto;\n background: #ffffff;\n }\n\n .px-hero {\n background: linear-gradient(135deg, #0f172a 0%, #0e7490 100%);\n padding: 60px 40px;\n text-align: center;\n color: white;\n }\n\n .px-hero .px-title {\n font-size: 2.6em;\n font-weight: 800;\n text-transform: uppercase;\n letter-spacing: 2px;\n margin: 0 0 10px 0;\n color: white;\n }\n\n .px-hero .px-subtitle {\n font-size: 1.2em;\n font-weight: 300;\n opacity: 0.9;\n margin: 0 0 30px 0;\n }\n\n .px-badges {\n display: flex;\n justify-content: center;\n flex-wrap: wrap;\n gap: 12px;\n margin-top: 20px;\n }\n\n .px-badge {\n background: rgba(6, 182, 212, 0.2);\n border: 1px solid #06b6d4;\n color: #67e8f9;\n padding: 8px 20px;\n border-radius: 20px;\n font-size: 0.9em;\n font-weight: 600;\n letter-spacing: 0.5px;\n }\n\n .px-section {\n padding: 50px 40px;\n border-bottom: 1px solid #e2e8f0;\n background: #ffffff;\n }\n\n .px-section:nth-child(even) {\n background: #f0f9ff;\n }\n\n .px-section h2 {\n color: #0e7490;\n font-size: 2em;\n font-weight: 700;\n margin: 0 0 20px 0;\n padding-bottom: 12px;\n border-bottom: 3px solid #06b6d4;\n }\n\n .px-section h3 {\n color: #0f172a;\n font-size: 1.4em;\n font-weight: 600;\n margin: 30px 0 15px 0;\n }\n\n .px-section p {\n font-size: 1.05em;\n color: #334155;\n margin-bottom: 18px;\n }\n\n .px-section ul {\n margin: 15px 0;\n padding-left: 25px;\n }\n\n .px-section li {\n font-size: 1.05em;\n color: #334155;\n margin-bottom: 10px;\n line-height: 1.7;\n }\n\n .px-grid {\n display: grid;\n grid-template-columns: repeat(2, 1fr);\n gap: 24px;\n margin: 30px 0;\n }\n\n .px-card {\n background: #ffffff;\n border: 1px solid #e2e8f0;\n border-top: 4px solid #06b6d4;\n border-radius: 6px;\n padding: 24px;\n }\n\n .px-card h4 {\n color: #0e7490;\n font-size: 1.15em;\n font-weight: 700;\n margin: 0 0 12px 0;\n }\n\n .px-card p {\n font-size: 1em;\n color: #475569;\n margin: 0;\n line-height: 1.7;\n }\n\n .px-highlight {\n background: #f0f9ff;\n border-left: 5px solid #06b6d4;\n padding: 24px 28px;\n margin: 28px 0;\n border-radius: 0 6px 6px 0;\n }\n\n .px-highlight h3 {\n color: #0e7490;\n margin: 0 0 12px 0;\n font-size: 1.2em;\n }\n\n .px-highlight p {\n margin-bottom: 10px;\n color: #1e293b;\n }\n\n .px-cta {\n background: linear-gradient(135deg, #0f172a 0%, #0e7490 100%);\n padding: 60px 40px;\n text-align: center;\n color: white;\n }\n\n .px-cta h2 {\n font-size: 2.2em;\n font-weight: 700;\n margin: 0 0 20px 0;\n color: white;\n border: none;\n padding: 0;\n }\n\n .px-cta p {\n font-size: 1.15em;\n opacity: 0.92;\n max-width: 800px;\n margin: 0 auto 20px auto;\n color: white;\n }\n\n .px-driver-link {\n display: inline-block;\n background: #f0f9ff;\n border: 2px solid #06b6d4;\n border-radius: 6px;\n padding: 16px 24px;\n margin: 10px 10px 10px 0;\n text-decoration: none;\n color: #0e7490;\n font-weight: 700;\n font-size: 1em;\n transition: all 0.2s ease;\n }\n\n .px-driver-link:hover {\n background: #06b6d4;\n color: white;\n }\n\n @media (max-width: 768px) {\n .px-hero { padding: 40px 20px; }\n .px-hero .px-title { font-size: 1.8em; }\n .px-section { padding: 30px 20px; }\n .px-section h2 { font-size: 1.6em; }\n .px-grid { grid-template-columns: 1fr; }\n .px-cta { padding: 40px 20px; }\n .px-cta h2 { font-size: 1.6em; }\n }\n\u003c\/style\u003e\n\n\u003cdiv class=\"px-desc\"\u003e\n\n \u003c!-- Hero --\u003e\n \u003cdiv class=\"px-hero\"\u003e\n \u003cp class=\"px-title\"\u003eProline X P8D-S\u003c\/p\u003e\n \u003cp class=\"px-subtitle\"\u003eDual 8\" Sealed Subwoofer Enclosure | V3\u003c\/p\u003e\n \u003cdiv class=\"px-badges\"\u003e\n \u003cspan class=\"px-badge\"\u003e0.90 ft³ Net\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003eSealed Alignment\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003e11.5\" Max Depth\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003eDual Independent Cups\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- Introduction --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eTwo Drivers. One Sealed Enclosure. Built for Installs That Need Width, Not Depth.\u003c\/h2\u003e\n \u003cp\u003eThe \u003cstrong\u003eProline X P8D-S\u003c\/strong\u003e is a dual 8\" sealed enclosure built for installs that need the output and soundstage of two drivers without the depth requirement of a larger single-driver ported box. At \u003cstrong\u003e0.90 ft³ net\u003c\/strong\u003e, 0.45 ft³ per driver, and sealed alignment, this enclosure delivers controlled, accurate bass across a wider presentation than a single 8\" can produce. Two drivers in sealed alignment produce a more even low-frequency field across the vehicle cabin, a wider perceived soundstage, and combined cone area that approaches a single 12\" driver.\u003c\/p\u003e\n \u003cp\u003eAt \u003cstrong\u003e19\" wide, 10\" tall, and 13\" deep\u003c\/strong\u003e, the P8D-S fits behind most rear seats and under most truck bench seats without requiring custom mounting. The \u003cstrong\u003e11.5\" max mounting depth\u003c\/strong\u003e is the deepest specification in the dual 8\" sealed lineup. It covers high-excursion competition motors that exceed the depth limit of shallower dual enclosures and opens up the compatible driver list considerably.\u003c\/p\u003e\n \u003cp\u003eTwo independent terminal cups handle wiring. Each driver gets its own recessed \u003cstrong\u003eABS\/Carbon Fiber Composite terminal cup\u003c\/strong\u003e with stainless hardware and copper ring terminals, pre-wired with \u003cstrong\u003e12g OFC speaker wire\u003c\/strong\u003e. Finish options are Dark Gray Trunkliner or Plush Black. Shipping is included.\u003c\/p\u003e\n \u003c\/div\u003e\n\n \u003c!-- Why Sealed --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eWhy Dual 8\" Sealed\u003c\/h2\u003e\n \u003cp\u003eTwo 8\" drivers in sealed alignment occupy a specific performance tier that no single-driver format replicates exactly. The combined cone area approaches a single 12\", but the individual driver mass remains low: each 8\" starts and stops with the speed and accuracy that the format is known for. The sealed alignment preserves that transient precision while the dual configuration adds output, width, and bass presence that a single 8\" sealed cannot match.\u003c\/p\u003e\n \u003cp\u003eAt 0.40 ft³ per driver, each chamber puts its driver in the center of the recommended sealed range for most 8\" subwoofers. No damping material needed. No volume correction required. Both drivers are working the same correctly-sized air load.\u003c\/p\u003e\n \u003cdiv class=\"px-grid\"\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eCombined Cone Area\u003c\/h4\u003e\n \u003cp\u003eTwo 8\" drivers produce combined cone area approaching a single 12\" while maintaining the low moving mass and transient speed that makes the 8\" format the preferred choice for SQ-oriented builds.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eWider Bass Presentation\u003c\/h4\u003e\n \u003cp\u003eTwo drivers spaced across a 19\" baffle produce a wider, more even low-frequency field across the vehicle cabin than a single point source. Bass is more evenly distributed from driver seat to passenger seat.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eTransient Accuracy Preserved\u003c\/h4\u003e\n \u003cp\u003eSealed alignment on both drivers preserves the start-stop precision that defines the 8\" format. The P8D-S produces tight, accurate bass at combined output levels that a single 8\" sealed cannot approach.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003e11.5\" Max Mounting Depth\u003c\/h4\u003e\n \u003cp\u003eThe deepest spec in the dual 8\" sealed lineup. High-excursion competition motors that will not fit the P8-S or shallower dual enclosures are candidates here. Check your driver's published mounting depth before ordering.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- Construction --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eConstruction: Two Independent Terminal Cups, One Consistent Build Standard\u003c\/h2\u003e\n \u003cp\u003eThe P8D-S uses the same Langboard Elite MDF, V-groove and dado joinery, and in-house terminal cup construction as every enclosure in the Proline X Performance Series. The distinguishing feature on the P8D-S is the dual independent terminal cup configuration. Each driver bay gets its own cup, its own wiring, and its own connection point.\u003c\/p\u003e\n\n \u003ch3\u003eLangboard Elite MDF, Named, Verified, Documented\u003c\/h3\u003e\n \u003cp\u003eEvery panel is cut from \u003cstrong\u003eLangboard Elite MDF: 3\/4\" (18mm)\u003c\/strong\u003e, a named, mill-documented panel stock produced in the United States. The specifications below are pulled directly from Langboard's published mill data.\u003c\/p\u003e\n\n \u003cdiv class=\"px-highlight\"\u003e\n \u003ch3\u003eLangboard Elite: Published Mill Data\u003c\/h3\u003e\n \u003cp\u003e\u003cstrong\u003eDensity:\u003c\/strong\u003e 48.5 lbs\/ft³, higher density means less porosity, better screw retention, and reduced resonance\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eInternal Bond:\u003c\/strong\u003e 200 psi, resistance to delamination under sustained bass pressure cycling\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eModulus of Elasticity:\u003c\/strong\u003e 410,000 psi, panel stiffness under load; less flex means less resonance\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eFace Screw Holding:\u003c\/strong\u003e 325 lbs, baffle hardware stays locked under vibration\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eEdge Screw Holding:\u003c\/strong\u003e 250 lbs, joint integrity at every panel edge connection\u003c\/p\u003e\n \u003c\/div\u003e\n\n \u003ch3\u003eV-Groove and Dado Joinery\u003c\/h3\u003e\n \u003cp\u003eEvery panel joint uses \u003cstrong\u003eV-groove and dado joinery\u003c\/strong\u003e, CNC-cut interlocking grooves that mechanically lock panels before adhesive is applied. For a sealed enclosure, joint integrity is non-negotiable, a single air leak degrades output and accuracy across the entire frequency range. Every seam on the P8D-S is mechanically locked before adhesive is applied.\u003c\/p\u003e\n\n \u003ch3\u003eDual Independent Terminal Cups\u003c\/h3\u003e\n \u003cp\u003eThe P8D-S uses two independent \u003cstrong\u003eABS\/Carbon Fiber Composite recessed terminal cups\u003c\/strong\u003e, one per driver bay, built in-house at our Tennessee facility. Each driver is wired independently to its own cup with stainless steel hardware, aluminum landing plates, and copper ring terminals, pre-wired with \u003cstrong\u003e12g OFC speaker wire\u003c\/strong\u003e. Independent cups allow you to run separate impedance loads per driver or wire to a bridged amplifier channel per side without dealing with internal splices you did not make.\u003c\/p\u003e\n\n \u003cdiv class=\"px-grid\"\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eShopSabre CNC Routers\u003c\/h4\u003e\n \u003cp\u003eEvery panel is machine-cut on ShopSabre industrial CNC routers. Both driver cutouts are machined to identical diameter and position. Consistent geometry across every unit.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eHand-Assembled in Tennessee\u003c\/h4\u003e\n \u003cp\u003eEvery enclosure is hand-assembled at our Tennessee facility and inspected before it ships. No overseas manufacturing. No batch assembly shortcuts.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eDark Gray Trunkliner or Plush Black\u003c\/h4\u003e\n \u003cp\u003eBoth finish options are professionally applied. Dark Gray Trunkliner blends with factory trunk materials. Plush Black delivers the traditional aftermarket look. Both are durably bonded for long-term wear.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eShipping Included\u003c\/h4\u003e\n \u003cp\u003eNo freight charges at checkout. The price you see is the price you pay. The enclosure ships assembled and ready to install.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- Fitment --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eFitment Guide\u003c\/h2\u003e\n \u003cp\u003eThe P8D-S is sized to fit behind most rear seats and under most truck bench seats. At \u003cstrong\u003e19\"W x 10\"H x 13\"D\u003c\/strong\u003e it occupies a footprint that works in most standard vehicle configurations without custom mounting.\u003c\/p\u003e\n\n \u003ch3\u003eDimensional Specifications\u003c\/h3\u003e\n \u003cdiv class=\"px-highlight\"\u003e\n \u003cp\u003e\u003cstrong\u003eExternal Dimensions:\u003c\/strong\u003e 19\" W x 10\" H x 13\" D\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eNet Internal Volume:\u003c\/strong\u003e 0.90 ft³ (0.45 ft³ per driver)\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eTuning Frequency:\u003c\/strong\u003e N\/A, Sealed\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eSubwoofer Cutout:\u003c\/strong\u003e 7.25\"\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eMax Mounting Depth:\u003c\/strong\u003e 11.5\"\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eFront Panel Thickness:\u003c\/strong\u003e 0.75\" Single Baffle\u003c\/p\u003e\n \u003c\/div\u003e\n\n \u003ch3\u003eDriver Compatibility\u003c\/h3\u003e\n \u003cp\u003eThe P8D-S accommodates any 8\" subwoofer with a cutout diameter at or below \u003cstrong\u003e7.25\"\u003c\/strong\u003e and a mounting depth at or below \u003cstrong\u003e11.5\"\u003c\/strong\u003e. Both drivers must be the same model and impedance. Verify published specifications before ordering.\u003c\/p\u003e\n\n \u003ch3\u003eCompatible Drivers\u003c\/h3\u003e\n \u003cp\u003eThe following drivers are available from Audio Intensity and are compatible with the P8D-S:\u003c\/p\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/image-dynamics-id8-v4-8inch-subwoofer\"\u003eImage Dynamics ID8 V4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-8-inch-subwoofer-nb2-series\"\u003eProdigy NB2-8D4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/image-dynamics-idq8d2-v4-8inch-subwoofer\"\u003eImage Dynamics IDQ8 V4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-8-inch-subwoofer-nb5-series\"\u003eProdigy NB5-8D4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/arc-audio-arc-series-8-subwoofer\"\u003eArc Audio Arc Series 8\" \u003c\/a\u003e\n \u003cp style=\"font-size:0.9em; color:#64748b; margin-top:12px;\"\u003eAlways verify cutout diameter and mounting depth against your specific driver's published specifications before ordering.\u003c\/p\u003e\n\n \u003ch3\u003eIdeal Install Applications\u003c\/h3\u003e\n \u003cdiv class=\"px-grid\"\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eBehind Rear Seat\u003c\/h4\u003e\n \u003cp\u003eAt 10\" tall and 13\" deep, the P8D-S fits behind most rear seats in full-size sedans and trucks. The 19\" width spans most rear floor openings without obstructing access to cargo or the spare tire.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eUnder Truck Bench Seat\u003c\/h4\u003e\n \u003cp\u003eThe low profile and 11.5\" max mounting depth make the P8D-S a strong candidate for under-seat installs in full-size trucks where high-excursion 8\" drivers are the target.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eSQ and Competition Builds\u003c\/h4\u003e\n \u003cp\u003eTwo sealed 8\" drivers produce the wide, even bass presentation and combined output that SQ competition builds demand, without the ported alignment that trades accuracy for efficiency.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eHigh-Excursion Driver Builds\u003c\/h4\u003e\n \u003cp\u003eThe 11.5\" max mounting depth is the deepest specification in the dual 8\" sealed lineup. Competition-grade 8\" motors that will not fit shallower enclosures are viable here.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- CTA --\u003e\n \u003cdiv class=\"px-cta\"\u003e\n \u003ch2\u003eDual 8\" Accuracy. Tennessee-Built. Shipping Included.\u003c\/h2\u003e\n \u003cp\u003eThe Proline X P8D-S delivers dual 8\" sealed performance from an enclosure that fits where larger boxes cannot. Langboard Elite MDF. V-groove and dado joinery. Dual independent terminal cups. Hand-assembled in Tennessee and inspected before it ships.\u003c\/p\u003e\n \u003cp\u003eTwo drivers. Sealed accuracy. Combined output a single 8\" cannot match. \u003cstrong\u003e$169.99 Dark Gray Trunkliner. $179.99 Plush Black.\u003c\/strong\u003e Shipping included.\u003c\/p\u003e\n \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Dark Gray Trunkliner","offer_id":43146777755737,"sku":"P8D-S III G","price":169.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":43146777788505,"sku":"P8D-S III B","price":179.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-p8d-s-dual-8-sealed-subwoofer-enclosure-v3subwoofer-enclosuresproline-x-8166518.png?v=1773362892"},{"product_id":"proline-x-p8d-p-dual-8-ported-subwoofer-enclosure-v3","title":"Proline X P8D-P | Dual 8\" Ported Subwoofer Enclosure | V3","description":"\u003cstyle\u003e\n .px-desc {\n font-family: 'Helvetica Neue', Arial, sans-serif;\n line-height: 1.8;\n color: #1e293b;\n max-width: 1200px;\n margin: 0 auto;\n background: #ffffff;\n }\n\n .px-hero {\n background: linear-gradient(135deg, #0f172a 0%, #0e7490 100%);\n padding: 60px 40px;\n text-align: center;\n color: white;\n }\n\n .px-hero .px-title {\n font-size: 2.6em;\n font-weight: 800;\n text-transform: uppercase;\n letter-spacing: 2px;\n margin: 0 0 10px 0;\n color: white;\n }\n\n .px-hero .px-subtitle {\n font-size: 1.2em;\n font-weight: 300;\n opacity: 0.9;\n margin: 0 0 30px 0;\n }\n\n .px-badges {\n display: flex;\n justify-content: center;\n flex-wrap: wrap;\n gap: 12px;\n margin-top: 20px;\n }\n\n .px-badge {\n background: rgba(6, 182, 212, 0.2);\n border: 1px solid #06b6d4;\n color: #67e8f9;\n padding: 8px 20px;\n border-radius: 20px;\n font-size: 0.9em;\n font-weight: 600;\n letter-spacing: 0.5px;\n }\n\n .px-section {\n padding: 50px 40px;\n border-bottom: 1px solid #e2e8f0;\n background: #ffffff;\n }\n\n .px-section:nth-child(even) {\n background: #f0f9ff;\n }\n\n .px-section h2 {\n color: #0e7490;\n font-size: 2em;\n font-weight: 700;\n margin: 0 0 20px 0;\n padding-bottom: 12px;\n border-bottom: 3px solid #06b6d4;\n }\n\n .px-section h3 {\n color: #0f172a;\n font-size: 1.4em;\n font-weight: 600;\n margin: 30px 0 15px 0;\n }\n\n .px-section p {\n font-size: 1.05em;\n color: #334155;\n margin-bottom: 18px;\n }\n\n .px-section ul {\n margin: 15px 0;\n padding-left: 25px;\n }\n\n .px-section li {\n font-size: 1.05em;\n color: #334155;\n margin-bottom: 10px;\n line-height: 1.7;\n }\n\n .px-grid {\n display: grid;\n grid-template-columns: repeat(2, 1fr);\n gap: 24px;\n margin: 30px 0;\n }\n\n .px-card {\n background: #ffffff;\n border: 1px solid #e2e8f0;\n border-top: 4px solid #06b6d4;\n border-radius: 6px;\n padding: 24px;\n }\n\n .px-card h4 {\n color: #0e7490;\n font-size: 1.15em;\n font-weight: 700;\n margin: 0 0 12px 0;\n }\n\n .px-card p {\n font-size: 1em;\n color: #475569;\n margin: 0;\n line-height: 1.7;\n }\n\n .px-highlight {\n background: #f0f9ff;\n border-left: 5px solid #06b6d4;\n padding: 24px 28px;\n margin: 28px 0;\n border-radius: 0 6px 6px 0;\n }\n\n .px-highlight h3 {\n color: #0e7490;\n margin: 0 0 12px 0;\n font-size: 1.2em;\n }\n\n .px-highlight p {\n margin-bottom: 10px;\n color: #1e293b;\n }\n\n .px-cta {\n background: linear-gradient(135deg, #0f172a 0%, #0e7490 100%);\n padding: 60px 40px;\n text-align: center;\n color: white;\n }\n\n .px-cta h2 {\n font-size: 2.2em;\n font-weight: 700;\n margin: 0 0 20px 0;\n color: white;\n border: none;\n padding: 0;\n }\n\n .px-cta p {\n font-size: 1.15em;\n opacity: 0.92;\n max-width: 800px;\n margin: 0 auto 20px auto;\n color: white;\n }\n\n .px-driver-link {\n display: inline-block;\n background: #f0f9ff;\n border: 2px solid #06b6d4;\n border-radius: 6px;\n padding: 16px 24px;\n margin: 10px 10px 10px 0;\n text-decoration: none;\n color: #0e7490;\n font-weight: 700;\n font-size: 1em;\n transition: all 0.2s ease;\n }\n\n .px-driver-link:hover {\n background: #06b6d4;\n color: white;\n }\n\n @media (max-width: 768px) {\n .px-hero { padding: 40px 20px; }\n .px-hero .px-title { font-size: 1.8em; }\n .px-section { padding: 30px 20px; }\n .px-section h2 { font-size: 1.6em; }\n .px-grid { grid-template-columns: 1fr; }\n .px-cta { padding: 40px 20px; }\n .px-cta h2 { font-size: 1.6em; }\n }\n\u003c\/style\u003e\n\n\u003cdiv class=\"px-desc\"\u003e\n\n \u003c!-- Hero --\u003e\n \u003cdiv class=\"px-hero\"\u003e\n \u003cp class=\"px-title\"\u003eProline X P8D-P\u003c\/p\u003e\n \u003cp class=\"px-subtitle\"\u003eDual 8\" Ported Subwoofer Enclosure | V3\u003c\/p\u003e\n \u003cdiv class=\"px-badges\"\u003e\n \u003cspan class=\"px-badge\"\u003e1.5 ft³ Net\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003e36Hz Tuning\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003ePorted Bass Reflex\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003eSingle Shared Cup\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\n \u003cspan class=\"px-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- Introduction --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eDual 8\" Ported Output. Compact Enough to Fit Where Larger Boxes Cannot.\u003c\/h2\u003e\n \u003cp\u003eThe \u003cstrong\u003eProline X P8D-P\u003c\/strong\u003e is a dual 8\" slot-ported enclosure built for installs that need serious output from a footprint that a 10\" or 12\" ported box cannot match. At \u003cstrong\u003e1.5 ft³ net\u003c\/strong\u003e, 0.75 ft³ per driver, and tuned to \u003cstrong\u003e36Hz\u003c\/strong\u003e, this enclosure gives two 8\" drivers the combined air space and port geometry to produce output that competes with a single 12\" ported enclosure while staying within the dimensional constraints of a dual 8\" build.\u003c\/p\u003e\n \u003cp\u003eAt \u003cstrong\u003e24\" wide, 11\" tall, and 16\" deep\u003c\/strong\u003e, the P8D-P is sized for a dedicated trunk build. The 16\" depth is the critical dimension. This enclosure fits across most trunk floors but is not a behind-seat option. The \u003cstrong\u003e7.3\" max mounting depth\u003c\/strong\u003e covers most standard 8\" drivers. A single terminal cup handles wiring for both drivers internally. Both drivers must be run at the same impedance.\u003c\/p\u003e\n \u003cp\u003eEvery panel is CNC-cut from \u003cstrong\u003eLangboard Elite MDF\u003c\/strong\u003e to exact internal volume and assembled by hand in our Tennessee facility. Port geometry is CNC-cut to exact dimensions. Tuning is consistent unit to unit. Finish options are Dark Gray Trunkliner or Plush Black. Shipping is included.\u003c\/p\u003e\n \u003c\/div\u003e\n\n \u003c!-- Why Ported --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eWhy Dual 8\" Ported at 36Hz\u003c\/h2\u003e\n \u003cp\u003eTwo 8\" drivers in a ported enclosure at 36Hz produce a fundamentally different output profile than either a dual 8\" sealed or a single larger ported driver. The combined cone area of two 8\" drivers approaches a single 12\", and the ported alignment at 36Hz pushes that combined output into the upper sub-bass range where the efficiency peak delivers the most audible impact. The result is output that fills larger vehicles and dedicated listening spaces without requiring a larger driver format.\u003c\/p\u003e\n \u003cp\u003eAt 0.75 ft³ per driver, each chamber is well within the recommended ported range for most 8\" subwoofers. Port velocity stays controlled at these volumes, no chuffing, no audible port noise at real-world listening levels. Both drivers are working the same correctly-sized air load at the same tuning frequency.\u003c\/p\u003e\n \u003cdiv class=\"px-grid\"\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eCombined Cone Area\u003c\/h4\u003e\n \u003cp\u003eTwo 8\" drivers in ported alignment produce combined cone area and output that approaches a single 12\" ported enclosure, in a box that is significantly shorter and fits installations a 12\" cannot.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003e36Hz Tuning: Efficient and Extended\u003c\/h4\u003e\n \u003cp\u003e36Hz places the port output peak in the upper sub-bass range where bass impact is most audible. Strong output from the mid-30s through the upper bass range without the port velocity issues that come with tuning too low on a dual 8\" build.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003e0.75 ft³ Per Driver\u003c\/h4\u003e\n \u003cp\u003eEach driver bay provides 0.75 ft³ of net internal volume, the center of the recommended ported range for most 8\" drivers. Both drivers operate at the same correctly-sized air load with controlled port velocity at listening levels.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eWide Bass Dispersion\u003c\/h4\u003e\n \u003cp\u003eTwo drivers spaced across a 24\" baffle produce a wider, more even bass presentation across the vehicle cabin than a single driver of any size. Low-frequency output is distributed more evenly from driver seat to passenger seat.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- Construction --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eConstruction: CNC-Cut Port Geometry, Single Shared Terminal Cup\u003c\/h2\u003e\n \u003cp\u003eThe P8D-P uses the same Langboard Elite MDF and V-groove and dado joinery construction as every enclosure in the Proline X Performance Series. The port geometry is CNC-cut to exact dimensions. Port length and cross-section are consistent unit to unit, which means tuning frequency does not vary between enclosures. A single terminal cup handles both drivers internally.\u003c\/p\u003e\n\n \u003ch3\u003eLangboard Elite MDF, Named, Verified, Documented\u003c\/h3\u003e\n \u003cp\u003eEvery panel is cut from \u003cstrong\u003eLangboard Elite MDF: 3\/4\" (18mm)\u003c\/strong\u003e, a named, mill-documented panel stock produced in the United States. The specifications below are pulled directly from Langboard's published mill data.\u003c\/p\u003e\n\n \u003cdiv class=\"px-highlight\"\u003e\n \u003ch3\u003eLangboard Elite: Published Mill Data\u003c\/h3\u003e\n \u003cp\u003e\u003cstrong\u003eDensity:\u003c\/strong\u003e 48.5 lbs\/ft³, higher density means less porosity, better screw retention, and reduced resonance\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eInternal Bond:\u003c\/strong\u003e 200 psi, resistance to delamination under sustained bass pressure cycling\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eModulus of Elasticity:\u003c\/strong\u003e 410,000 psi, panel stiffness under load; less flex means less resonance\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eFace Screw Holding:\u003c\/strong\u003e 325 lbs, baffle hardware stays locked under vibration\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eEdge Screw Holding:\u003c\/strong\u003e 250 lbs, joint integrity at every panel edge connection\u003c\/p\u003e\n \u003c\/div\u003e\n\n \u003ch3\u003eV-Groove and Dado Joinery\u003c\/h3\u003e\n \u003cp\u003eEvery panel joint uses \u003cstrong\u003eV-groove and dado joinery\u003c\/strong\u003e, CNC-cut interlocking grooves that mechanically lock panels before adhesive is applied. Port panels are joined with the same interlocking geometry as the enclosure walls, consistent, airtight, and resistant to shear forces at the joint level rather than relying solely on adhesive.\u003c\/p\u003e\n\n \u003ch3\u003eSingle Terminal Cup: Same Impedance Required\u003c\/h3\u003e\n \u003cp\u003eThe P8D-P uses a single \u003cstrong\u003eABS\/Carbon Fiber Composite recessed terminal cup\u003c\/strong\u003e built in-house at our Tennessee facility. Both drivers are wired internally to the cup with stainless steel hardware, aluminum landing plates, and copper ring terminals, pre-wired with \u003cstrong\u003e12g OFC speaker wire\u003c\/strong\u003e. Both drivers must be run at the same impedance. Confirm your amplifier output and driver impedances match before wiring.\u003c\/p\u003e\n\n \u003cdiv class=\"px-grid\"\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eCNC-Cut Port Geometry\u003c\/h4\u003e\n \u003cp\u003ePort length, cross-section, and position are machine-cut to exact dimensions on ShopSabre CNC routers. Tuning frequency is consistent unit to unit. No hand-cut variance in port dimensions.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eHand-Assembled in Tennessee\u003c\/h4\u003e\n \u003cp\u003eEvery enclosure is hand-assembled at our Tennessee facility and inspected before it ships. No overseas manufacturing. No batch assembly shortcuts.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eDark Gray Trunkliner or Plush Black\u003c\/h4\u003e\n \u003cp\u003eBoth finish options are professionally applied. Dark Gray Trunkliner blends with factory trunk materials. Plush Black delivers the traditional aftermarket look. Both are durably bonded for long-term wear.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eShipping Included\u003c\/h4\u003e\n \u003cp\u003eNo freight charges at checkout. The price you see is the price you pay. The enclosure ships assembled and ready to install.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- Fitment --\u003e\n \u003cdiv class=\"px-section\"\u003e\n \u003ch2\u003eFitment Guide\u003c\/h2\u003e\n \u003cp\u003eThe P8D-P is a dedicated trunk build. At \u003cstrong\u003e24\"W x 11\"H x 16\"D\u003c\/strong\u003e, the 16\" depth makes this a trunk floor enclosure, not a behind-seat option. Measure your available trunk depth carefully before ordering.\u003c\/p\u003e\n\n \u003ch3\u003eDimensional Specifications\u003c\/h3\u003e\n \u003cdiv class=\"px-highlight\"\u003e\n \u003cp\u003e\u003cstrong\u003eExternal Dimensions:\u003c\/strong\u003e 24\" W x 11\" H x 16\" D\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eNet Internal Volume:\u003c\/strong\u003e 1.5 ft³ (0.75 ft³ per driver)\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eTuning Frequency:\u003c\/strong\u003e 36Hz\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eSubwoofer Cutout:\u003c\/strong\u003e 7.25\"\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eMax Mounting Depth:\u003c\/strong\u003e 7.3\"\u003c\/p\u003e\n \u003cp\u003e\u003cstrong\u003eFront Panel Thickness:\u003c\/strong\u003e 0.75\" Single Baffle\u003c\/p\u003e\n \u003c\/div\u003e\n\n \u003ch3\u003eDriver Compatibility\u003c\/h3\u003e\n \u003cp\u003eThe P8D-P accommodates any 8\" subwoofer with a cutout diameter at or below \u003cstrong\u003e7.25\"\u003c\/strong\u003e and a mounting depth at or below \u003cstrong\u003e7.3\"\u003c\/strong\u003e. Both drivers must be the same model and impedance. Verify published specifications before ordering.\u003c\/p\u003e\n\n \u003ch3\u003eCompatible Drivers\u003c\/h3\u003e\n \u003cp\u003eThe following drivers are available from Audio Intensity and are compatible with the P8D-P:\u003c\/p\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/image-dynamics-id8-v4-8inch-subwoofer\"\u003eImage Dynamics ID8 V4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-8-inch-subwoofer-nb2-series\"\u003eProdigy NB2-8D4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/image-dynamics-idq8d2-v4-8inch-subwoofer\"\u003eImage Dynamics IDQ8 V4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-8-inch-subwoofer-nb5-series\"\u003eProdigy NB5-8D4 \u003c\/a\u003e\n \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/arc-audio-arc-series-8-subwoofer\"\u003eArc Audio Arc Series 8\" \u003c\/a\u003e\n \u003cp style=\"font-size:0.9em; color:#64748b; margin-top:12px;\"\u003eAlways verify cutout diameter and mounting depth against your specific driver's published specifications before ordering. Both drivers must be run at the same impedance.\u003c\/p\u003e\n\n \u003ch3\u003eIdeal Install Applications\u003c\/h3\u003e\n \u003cdiv class=\"px-grid\"\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eDedicated Trunk Builds\u003c\/h4\u003e\n \u003cp\u003eAt 24\" wide and 16\" deep, the P8D-P is designed to span a trunk floor. The 16\" depth requires a dedicated trunk install. Measure your available depth before ordering.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eHigh-Output Compact Systems\u003c\/h4\u003e\n \u003cp\u003eTwo 8\" drivers in ported alignment produce output that competes with a single 12\" ported enclosure in a box that fits installations a 12\" cannot reach. Maximum output from the dual 8\" format.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eWide Soundstage Builds\u003c\/h4\u003e\n \u003cp\u003eTwo drivers spaced across a 24\" baffle produce a wider bass presentation than any single-driver enclosure. For installs where even bass distribution across the full cabin width is the goal.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003cdiv class=\"px-card\"\u003e\n \u003ch4\u003eStep Up From Sealed\u003c\/h4\u003e\n \u003cp\u003eFor builds currently running the P8D-S that need more output and lower frequency extension, the P8D-P is the direct step up. Same driver compatibility, significantly more output.\u003c\/p\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- CTA --\u003e\n \u003cdiv class=\"px-cta\"\u003e\n \u003ch2\u003eDual 8\" Ported Output. Tennessee-Built. Shipping Included.\u003c\/h2\u003e\n \u003cp\u003eThe Proline X P8D-P delivers dual 8\" ported performance from an enclosure that fits where larger boxes cannot. Langboard Elite MDF. V-groove and dado joinery. CNC-cut port geometry. In-house terminal cup. Hand-assembled in Tennessee and inspected before it ships.\u003c\/p\u003e\n \u003cp\u003eTwo drivers. Ported efficiency. Output that competes with a single 12\". \u003cstrong\u003e$199.99 Dark Gray Trunkliner. $209.99 Plush Black.\u003c\/strong\u003e Shipping included.\u003c\/p\u003e\n \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Dark Gray Trunkliner","offer_id":43146880450649,"sku":"P8D-P III G","price":199.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":43146880483417,"sku":"P8D-P III B","price":209.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/products\/proline-x-performance-p8d-p-ported-enclosure-for-dual-8subwoofer-enclosuresproline-x-428828.jpg?v=1761969155"},{"product_id":"proline-x-enclosure-x-series-fits-kicker-solo-x-8-subwoofer-dual","title":"Kicker Solo-Baric L7X 8 Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 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0}.df-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#a8a29e;margin:0 0 10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Enclosure | X Series | Fits Kicker Solo X 8\" Subwoofer | Dual\u003c\/h2\u003e\n  \u003cp\u003eAudio Intensity and Proline X are not affiliated with Kicker. This enclosure is built to the published parameters of the Kicker Solo-Baric L7X.\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.74 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 38.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the Kicker Solo-Baric L7X 8\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 38.5 Hz\u003c\/h3\u003e\n  \u003cp\u003eTwo Solo-Baric L7X 8 drivers share this cabinet's common airspace: 1.74 cubic feet net total, vented at 38.5 Hz through a 43.8 square inch slot. Doubling the driver count doubles the airspace and the port area together, so each L7X 8 still sees the same per-driver conditions as the single-eight box.\u003c\/p\u003e\n  \u003cp\u003eF3 lands at 31.9 Hz on this pair, close to the single-eight figure because the per-driver airspace is essentially unchanged. The port stays under the chuff threshold up to 960 W combined, above which the mouth velocity crosses Kicker's own reference. Ripple lands at 4.66 dB, over the ceiling we hold new designs to; this is the alignment Kicker publishes for the L7X and the box is built to it. Set the subsonic filter at 30 Hz and leave it there below tuning.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 16.62\" D external, internally braced. It ships as a UPS parcel; the price includes shipping in the 48 states.\u003c\/p\u003e\n  \u003cp\u003eThis is our dual-eight envelope, sized for two L7X 8 drivers on one shared chamber. The baffle cutouts are machined to the L7X's square frame, which is not cross-compatible with round-frame drivers of the same nominal size. You source the driver. We handle the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \u003cp\u003eKicker's own Klippel rig measured the L7X 8 under SKU 49L7X82, the same parameters carried into both drivers in this dual cabinet; the Dual 2 Ohm coil is the one they publish, and the cabinet fits either the D1 or D2 version of the driver. Kicker publishes no outer frame dimension for the L7X, so the frame OD used here, 8.8125 inches, is estimated from the published cutout. Audio Intensity and Proline X are not affiliated with Kicker.\u003c\/p\u003e\n  \u003cp\u003eThis cabinet is 1.74 cubic feet net, with a slot port of 43.8 square inches tuned to 38.5 Hz; the port stays under the chuff threshold at 960 W, the design power basis.\u003c\/p\u003e\n  \u003cp\u003eSet a 30 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in place the cone reaches 9.5 mm of its 24.0 mm at 960 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Hex and Flag","offer_id":43165552279641,"sku":"Pro8D-P KIK HEX","price":506.99,"currency_code":"USD","in_stock":true},{"title":"None - Carpet Only","offer_id":43165552214105,"sku":"Pro8D-P KIK NA","price":476.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-enclosure-x-series-fits-kicker-solo-x-8-subwoofer-dualsubwoofer-enclosuresproline-x-5634581.jpg?v=1774535928"},{"product_id":"proline-x-performance-optimized-wedge-enclosure-fits-dual-kicker-solo-x-8-subwoofers","title":"Kicker Solo-X 8 Dual Box: Sealed 8\" Wedge Enclosure","description":"\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: #ffffff; }\n  .po-hero { background: linear-gradient(135deg, #0f172a 0%, #8b5a2b 100%); padding: 60px 40px; text-align: center; color: white; }\n  .po-hero .po-title { font-size: 2.6em; font-weight: 800; text-transform: uppercase; letter-spacing: 2px; margin: 0 0 10px 0; color: white; }\n  .po-hero .po-subtitle { font-size: 1.2em; font-weight: 300; opacity: 0.9; 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, 0.2); border: 1px solid #b87333; color: #d99058; padding: 8px 20px; border-radius: 20px; font-size: 0.9em; font-weight: 600; letter-spacing: 0.5px; }\n  .po-section { padding: 50px 40px; border-bottom: 1px solid #e2e8f0; background: #ffffff; }\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: #ffffff; 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: 0.98em; 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: white; }\n  .po-cta h2 { font-size: 2.2em; font-weight: 700; margin: 0 0 20px 0; color: white; border: none; padding: 0; }\n  .po-cta p { font-size: 1.15em; opacity: 0.92; max-width: 800px; margin: 0 auto 20px auto; color: white; }\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-wrap\"\u003e\n\u003cdiv class=\"po-hero\"\u003e\n\u003cp class=\"po-title\"\u003ePerformance Optimized Wedge | Dual Kicker Solo X 8\u003c\/p\u003e\n\u003cp class=\"po-subtitle\"\u003eDual 8\" Sealed Wedge Enclosure | Behind-Seat Wedge Design for Two Kicker Solo X L7X 8s\u003c\/p\u003e\n\u003cdiv class=\"po-badges\"\u003e\n\u003cspan class=\"po-badge\"\u003e1.22 ft³ Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.51 ft³ Net \/ Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.707 Butterworth\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e25.25\" × 11.75\" × 10\/14.25\"\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eV-Groove \/ Dado\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 Kicker Solo X 8s in a Purpose-Built Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe Solo X L7X 8 packs Kicker's square-cone SoloX architecture and a high-mass ferrite motor into the 8-inch class, and a matched pair in properly solved sealed chambers delivers serious cone area with small-driver speed. This wedge was computed directly from Kicker's factory Thiele\/Small parameters, not adapted from a generic dual 8\" box.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003eA 3\/4\" divider splits the box into two identical sealed chambers, 0.51 cu ft net each after driver displacement. That lands each dual 1-ohm Solo X 8 at a textbook Qtc of 0.707, the true Butterworth alignment, with dual 2-ohm drivers at 0.74 in the same chambers.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eBehind-Seat Wedge Design Explained\u003c\/h2\u003e\n\u003cp\u003eThis is a front-firing wedge built for behind-seat and rear-wall installs. The rear panel is vertical and sits flat against the cab wall; both woofers mount on the baffle, raked back 20 degrees to follow the seat lean.\u003c\/p\u003e\n\u003cdiv class=\"po-grid\"\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eVertical Rear Panel\u003c\/h4\u003e\n\u003cp\u003eSits flush against the cab back wall or trunk bulkhead, so the full footprint of the box goes to airspace instead of wasted gaps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003e20° Raked Baffle\u003c\/h4\u003e\n\u003cp\u003eMatches the lean of most factory seat backs and fires both Solo X drivers forward into the cabin instead of into the seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eChambered and Braced\u003c\/h4\u003e\n\u003cp\u003eThe 3\/4\" dado-locked center divider isolates each driver in its own sealed chamber and doubles as a full-height brace, killing panel resonance in the largest spans.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eCarpet-Wrap Ledge\u003c\/h4\u003e\n\u003cp\u003eA recessed perimeter ledge terminates the carpet cleanly at the baffle edge for a finished, factory look.\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 Kicker Solo X 8\u003c\/h2\u003e\n\u003cp\u003eEach chamber is built to 0.51 cubic feet net, the airspace that puts the dual 1-ohm 49L7X81 exactly on the Butterworth alignment. Qtc 0.707 delivers the flattest response and tightest transient control a sealed enclosure can produce: no peaking, no overhang, bass that starts and stops with the recording. Dual 2-ohm 49L7X82 drivers run 0.74 in the same chambers, still squarely inside the accurate, musical zone. Because the chambers are identical, both drivers stay perfectly matched.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Driver)\u003c\/h3\u003e\n\u003cp\u003eDual 1-Ohm: Qtc 0.707 · Fc 54 Hz · F3 54 Hz — Dual 2-Ohm: Qtc 0.74 · Fc 54 Hz · F3 52.2 Hz\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eEach baffle opening is CNC-cut to 7-5\/16\" (Kicker spec). Mounting depth required is 7-15\/16\", cleared with margin at every point of the stroke, including breathing room for the vented motor. 8\/32 threaded inserts pressed into the baffle backside.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eSealed Alignment Response\u003c\/h2\u003e\n\u003cp\u003ePredicted anechoic response of each Solo X 8 in its own 0.51 cu ft sealed chamber, computed from Kicker factory T\/S parameters. This enclosure ships without drivers, so both coil variants are plotted; they do not load the same chamber identically.\u003c\/p\u003e\n\u003csvg viewbox=\"0 0 700 330\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Sealed frequency response of the Kicker Solo X 8 in each chamber of this enclosure, both coil variants, with the minus 3 dB reference line\" style=\"width:100%;height:auto;background:#ffffff;border:1px solid #e2e8f0;border-radius:4px;\"\u003e\n\u003crect x=\"70\" y=\"20\" width=\"610\" height=\"240\" fill=\"#ffffff\"\u003e\u003c\/rect\u003e\n\u003cg stroke=\"#e2e8f0\" stroke-width=\"1\"\u003e\n\u003cline x1=\"70\" y1=\"20\" x2=\"70\" y2=\"260\"\u003e\u003c\/line\u003e\u003cline x1=\"177.4\" y1=\"20\" x2=\"177.4\" y2=\"260\"\u003e\u003c\/line\u003e\u003cline x1=\"312.7\" y1=\"20\" x2=\"312.7\" y2=\"260\"\u003e\u003c\/line\u003e\u003cline x1=\"401.9\" y1=\"20\" x2=\"401.9\" y2=\"260\"\u003e\u003c\/line\u003e\u003cline x1=\"496.4\" y1=\"20\" x2=\"496.4\" 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L518,70.0 L531,69.7 L543,69.4 L556,69.2 L568,69.0 L580,68.8 L593,68.7 L605,68.6 L618,68.5 L630,68.4 L643,68.3 L655,68.3 L668,68.2 L680,68.2\" fill=\"none\" stroke=\"#b87333\" stroke-width=\"3\"\u003e\u003c\/path\u003e\n\u003cg font-family=\"Helvetica Neue, Arial, sans-serif\" font-size=\"11\" fill=\"#64748b\"\u003e\n\u003ctext x=\"70\" y=\"276\" text-anchor=\"middle\"\u003e20\u003c\/text\u003e\u003ctext x=\"177.4\" y=\"276\" text-anchor=\"middle\"\u003e30\u003c\/text\u003e\u003ctext x=\"312.7\" y=\"276\" text-anchor=\"middle\"\u003e50\u003c\/text\u003e\u003ctext x=\"401.9\" y=\"276\" text-anchor=\"middle\"\u003e70\u003c\/text\u003e\u003ctext x=\"496.4\" y=\"276\" text-anchor=\"middle\"\u003e100\u003c\/text\u003e\u003ctext x=\"603.8\" y=\"276\" text-anchor=\"middle\"\u003e150\u003c\/text\u003e\u003ctext x=\"680\" y=\"276\" text-anchor=\"middle\"\u003e200\u003c\/text\u003e\n\u003ctext x=\"62\" y=\"24\" text-anchor=\"end\"\u003e+6\u003c\/text\u003e\u003ctext x=\"62\" y=\"72\" text-anchor=\"end\"\u003e0\u003c\/text\u003e\u003ctext x=\"62\" y=\"120\" text-anchor=\"end\"\u003e−6\u003c\/text\u003e\u003ctext x=\"62\" y=\"168\" text-anchor=\"end\"\u003e−12\u003c\/text\u003e\u003ctext x=\"62\" y=\"216\" text-anchor=\"end\"\u003e−18\u003c\/text\u003e\u003ctext x=\"62\" y=\"264\" text-anchor=\"end\"\u003e−24\u003c\/text\u003e\n\u003ctext x=\"375\" y=\"296\" text-anchor=\"middle\" letter-spacing=\"1\"\u003eFREQUENCY · Hz\u003c\/text\u003e\n\u003ctext x=\"20\" y=\"140\" text-anchor=\"middle\" transform=\"rotate(-90 20 140)\" letter-spacing=\"1\"\u003eLEVEL · dB\u003c\/text\u003e\n\u003c\/g\u003e\n\u003cg font-family=\"Helvetica Neue, Arial, sans-serif\" font-size=\"12\"\u003e\n\u003crect x=\"80\" y=\"308\" width=\"18\" height=\"4\" fill=\"#b87333\"\u003e\u003c\/rect\u003e\u003ctext x=\"104\" y=\"313\" fill=\"#334155\"\u003eD1 · Qtc 0.707, Fc 54 Hz, F3 54 Hz\u003c\/text\u003e\n\u003crect x=\"330\" y=\"308\" width=\"18\" height=\"4\" fill=\"#0f172a\"\u003e\u003c\/rect\u003e\u003ctext x=\"354\" y=\"313\" fill=\"#334155\"\u003eD2 · Qtc 0.74, Fc 54 Hz, F3 52.2 Hz\u003c\/text\u003e\n\u003c\/g\u003e\n\u003c\/svg\u003e\n\u003cp\u003eThe dashed line marks the half-power point. Roll-off below F3 is the gentle 12 dB\/octave slope characteristic of sealed alignments, which cabin gain in a real vehicle substantially fills in. Run the numbers yourself with our \u003ca href=\"\/pages\/sealed-box-calculator\"\u003esealed box calculator\u003c\/a\u003e.\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\" MDF panels milled to documented spec.\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. Dado joints lock the raked baffle, vertical rear panel, and center divider into the side walls.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDouble-Layer 1.5\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4\" MDF sheets plus a trim layer at the driver mounting face. Two Solo X 8s put serious mechanical load into the baffle; it does not flex.\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\/carbon-fiber composite terminal cup, side-mounted, with 12 gauge OFC pre-wired.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eFinish and Trim\u003c\/h2\u003e\n\u003ch3\u003ePlush Black Carpet\u003c\/h3\u003e\n\u003cp\u003eEvery enclosure ships wrapped in plush black automotive carpet, the standard finish for the PO Wedge line.\u003c\/p\u003e\n\u003ch3\u003eBlack Acrylic Insert\u003c\/h3\u003e\n\u003cp\u003eThe signature Proline X acrylic insert comes in black.\u003c\/p\u003e\n\u003ch3\u003eBox-Only\u003c\/h3\u003e\n\u003cp\u003eThis listing is box-only. Bring your own pair of Solo X 8s.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring Two Kicker Solo X 8s to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eKicker recommends 400-800 watts RMS per Solo X 8, so plan 800-1600 watts RMS of clean system power across the pair at your wired impedance. Match both drivers to the same coil configuration so the pair loads and wires symmetrically; sealed loading keeps cone travel controlled through the passband.\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\u003eManufactured in Tullahoma, Tennessee on our ShopSabre CNC equipment. 1-year limited warranty. Call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003eDual Kicker Solo X 8s: True Butterworth, Twice Over\u003c\/h2\u003e\n\u003cp\u003eTwo identical 0.51 cubic foot sealed chambers, solved from factory T\/S to land each Solo X 8 at Qtc 0.707. Double the cone area, the same flat, tight alignment, in a wedge that disappears behind the seat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":44575779749977,"sku":"PO 8D-S W Solo X","price":419.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_W_Solo_X_Front.jpg?v=1791219705"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-powerbass-xl844","title":"PowerBass XL-844 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 | PowerBass XL-844\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\"\u003e0.50 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 0.61\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eRear-Firing Wedge\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 11\" x 7.80\/11.80\"\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\u003eThe PowerBass XL-844 in a Dual-Driver Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eA 2 inch vented BASV voice coil with Aero-Vent perimeter cooling, a DDC coated non-pressed paper cone and a 200 watt RMS rating. The alignment below is computed from PowerBass's own published Thiele-Small parameters.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.50 cubic feet net per driver is PowerBass's published sealed recommendation for the XL-844, and this cabinet is cut to it exactly. Gross is 0.55 cu ft per chamber before the driver's 0.0373 cu ft displacement.\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 divider runs floor to ceiling and front to back, giving each XL-844 its own sealed 0.55 cu ft gross chamber. Neither cone loads against the other, so the pair stays predictable under hard excursion. Each chamber is cut to the same volume the single version delivers, so the alignment is identical whichever you buy.\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 XL-844 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 PowerBass XL-844\u003c\/h2\u003e\n\u003cp\u003eAt 0.50 cubic feet net the XL-844 runs a system Qtc of \u003cstrong\u003e0.610\u003c\/strong\u003e, a dry, tightly controlled alignment. PowerBass publishes 0.650 for this driver at the same airspace, so the cabinet and the maker agree.\u003c\/p\u003e\n\u003cp\u003eF3 lands at 59.8 Hz anechoic. That is high for a 8 inch, and it is the driver rather than the cabinet: at a Qts of 0.506 the XL-844 is past the knee for sealed loading, so no sealed box gets it much below 61 Hz. Adding volume makes it worse, not better. If you want the deepest sealed 8 inch in this range, the XL-1244 reaches 46.2 Hz.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers\u003c\/h3\u003e\n\u003cp\u003eQtc 0.610 · fc 50.5 Hz · F3 59.8 Hz anechoic · Qts 0.506, Vas 6.44 L, Fs 41.9 Hz as published\u003c\/p\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eVertical baffle CNC cut to 7.1250 in. Driver mounting depth 4.4375 in required. 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\" Front 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 PowerBass XL-844 Pair to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eEach driver is a single 4 ohm voice coil. A pair is \u003cstrong\u003e2 ohms in parallel\u003c\/strong\u003e or 8 ohms in series. Two ohms is the usual choice and almost every monoblock is stable there.\u003c\/p\u003e\n\u003cp\u003ePower handling is 400 watts RMS total across the pair. Aim for roughly 280 to 400 watts at the final wired impedance.\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 PowerBass XL-844 drivers are purchased separately. Call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-cta\"\u003e\n\u003ch2\u003ePowerBass XL-844 Dual: Cut to PowerBass's Own Airspace\u003c\/h2\u003e\n\u003cp\u003e0.50 cubic feet net per driver at Qtc 0.61, F3 59.8 Hz, built to order in Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Black","offer_id":44607091441753,"sku":"PO 8D-S W XL844 BB","price":269.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":44607092686937,"sku":"PO 8D-S W XL844 B","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO8D-SWXLFront.jpg?v=1788132413"},{"product_id":"professional-series-ported-dual-8-enclosure-dd-audio-508e","title":"DD Audio 508e Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 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0}.df-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#a8a29e;margin:0 0 10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of 508e, one shared chamber vented at 34.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.61 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 34.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 28.1 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the 508e\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.61\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e34.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e28.1\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e31.2\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 34.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two 508e in 1.613 cubic feet net, vented at 34.0 Hz through a 31.2 square inch port. F3 lands at 28.1 Hz with 3.99 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 13.88 deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e DD Audio does not publish the mounting hole locations for the 508e, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 31.2 square inches of area at 34.0 Hz, and the design power for the velocity and excursion checks is 1200 W for the pair. Passband ripple holds at 3.99 dB across the tuning, with F3 at 28.1 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDD Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the DD Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 1200 W\u003c\/h4\u003e\n\u003cp\u003eThe 31.2 square inch slot beside the woofer is sized so the\n    channel runs 23.6 metres per second and the mouth 15.6 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 7.62 inches along its wall and turns once along the back wall for another 21.85 inches, which is why a 34.0 Hz tuning fits a 13.88 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eEvery driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The 508e did not clear the channel 28.1 m\/s over 0.55 x core 35.2 gate there: the nearest wedge that fits is 29.5 by 8.75 by 13.03 inches with a 13.0 square inch port, and no tuning, width or depth inside that envelope passes. The slot on this box reaches 31.2 square inches.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 3.82 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 54 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 13.88\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the 508e's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 15.6 m\/s against the 17 m\/s point where a slot begins to chuff, and 23.6 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for. DD Audio does not publish the mounting hole locations for the 508e, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 27 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 10.3 mm of its 14.0 mm at 1200 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":44857457836121,"sku":"Pro 8D-P 508E","price":461.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_cff78456-415b-49e3-9a47-8b2c402bd210.jpg?v=1788925273"},{"product_id":"professional-series-ported-dual-8-enclosure-ground-zero-gzrw-8xspl","title":"Ground Zero GZRW 8XSPL Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero p{font-size:1.1em;font-weight:300;opacity:.93;margin:0 0 22px;color:#d6d3d1}.df-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:10px}.df-badge{background:rgba(91,120,255,.18);border:1px solid #5b78ff;color:#99abff;padding:7px 16px;border-radius:18px;font-size:.8em;font-weight:600}.df-stats{display:flex;flex-wrap:wrap;background:#1c1917}.df-stat{flex:1 1 200px;text-align:center;padding:26px 16px;border-right:1px solid #292524;border-bottom:1px solid #292524}.df-stat .n{display:block;font-size:1.6em;font-weight:800;color:#7089ff}.df-stat .l{display:block;font-size:.78em;color:#a8a29e;text-transform:uppercase;letter-spacing:.6px;margin-top:5px}.df-section{padding:42px 36px;border-bottom:1px solid #292524;background:#0c0a09}.df-section:nth-of-type(even){background:#1c1917}.df-section h3{color:#fff;font-size:1.45em;font-weight:700;margin:0 0 14px;border-left:4px solid #5b78ff;padding-left:14px}.df-section p{margin:0 0 14px;color:#d6d3d1}.df-section strong{color:#fff}.df-grid{display:flex;flex-wrap:wrap;gap:18px;margin-top:8px}.df-card{flex:1 1 280px;background:#1c1917;border:1px solid #292524;border-top:3px solid #5b78ff;border-radius:8px;padding:20px 22px}.df-card h4{color:#99abff;margin:0 0 8px;font-size:1.04em}.df-card p{margin:0;font-size:.95em;color:#a8a29e}.df-card strong{color:#fff}.df-highlight{background:#001264;border-left:4px solid #5b78ff;border-radius:0 8px 8px 0;padding:18px 22px;margin:18px 0}.df-highlight p{margin:0;color:#d6d3d1}.df-highlight strong{color:#fff}.df-enc{background:#1c1917;color:#d6d3d1;padding:42px 36px;border-bottom:1px solid #292524}.df-enc h3{color:#fff;font-size:1.45em;font-weight:700;margin:0 0 14px;border-left:4px solid #5b78ff;padding-left:14px}.df-enc p{margin:0 0 14px;color:#d6d3d1}.df-enc-card{background:#292524;border:1px solid #44403c;border-radius:8px;overflow:hidden;margin:18px 0}.df-enc-head{padding:12px 16px;font-size:.82em;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:#99abff;background:#001264}.df-enc-table{width:100%;border-collapse:collapse}.df-enc-table th{background:#0c0a09;color:#a8a29e;font-size:.78em;text-transform:uppercase;letter-spacing:.5px;padding:10px 14px;text-align:left;border-bottom:1px solid #44403c}.df-enc-table td{padding:12px 14px;border-bottom:1px solid #292524;color:#d6d3d1;font-size:.95em}.df-enc-table tr:last-child td{border-bottom:none}.df-opt td{background:#14532d;color:#fff;font-weight:600}.df-char{display:block;font-size:.78em;color:#a8a29e;font-weight:400;margin-top:2px}.df-opt .df-char{color:#86efac}.df-graph{background:#0c0a09;border:1px solid #44403c;border-radius:8px;padding:14px;margin:18px 0}.df-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#a8a29e;margin:0 0 10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of GZRW 8XSPL, one shared chamber vented at 34.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.76 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 34.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 29.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the GZRW 8XSPL\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.76\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e34.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e29.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e31.2\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 34.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two GZRW 8XSPL in 1.760 cubic feet net, vented at 34.0 Hz through a 31.2 square inch port. F3 lands at 29.5 Hz with 3.04 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 14.25 deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e Ground Zero does not publish the mounting hole locations for the GZRW 8XSPL, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 31.2 square inches of area at 34.0 Hz, and the design power for the velocity and excursion checks is 1200 W for the pair. Passband ripple holds at 3.04 dB across the tuning, with F3 at 29.5 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eGround Zero logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Ground Zero mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 1200 W\u003c\/h4\u003e\n\u003cp\u003eThe 31.2 square inch slot beside the woofer is sized so the\n    channel runs 24.9 metres per second and the mouth 16.5 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 8.00 inches along its wall and turns once along the back wall for another 18.04 inches, which is why a 34.0 Hz tuning fits a 14.25 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eA single GZRW 8XSPL also builds in the Performance Optimized ported down-fire, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 1200 W for the pair.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 3.93 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 54 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 14.25\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the GZRW 8XSPL's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 16.5 m\/s against the 17 m\/s point where a slot begins to chuff, and 24.9 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for. Ground Zero does not publish the mounting hole locations for the GZRW 8XSPL, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 27 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 8.5 mm of its 14.0 mm at 1200 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":44857459703897,"sku":"Pro 8D-P GZRW8","price":468.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_e82f281a-bcd5-40c5-b507-7cd4f75add7a.jpg?v=1788925381"},{"product_id":"professional-series-ported-dual-8-enclosure-sundown-audio-m-series-m8","title":"Sundown Audio M-Series M8 Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 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10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of M-Series M8, one shared chamber vented at 33.5 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.79 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 33.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 28.7 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the M-Series M8\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.79\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e33.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e28.7\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e34.4\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 33.5 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two M-Series M8 in 1.788 cubic feet net, vented at 33.5 Hz through a 34.4 square inch port. F3 lands at 28.7 Hz with 4.38 dB of passband ripple. It measures 33.50 inches wide, 14.00 tall and 15.62 deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e Sundown Audio does not publish the mounting hole locations for the M-Series M8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 34.4 square inches of area at 33.5 Hz, and the design power for the velocity and excursion checks is 1600 W for the pair. Passband ripple holds at 4.38 dB across the tuning, with F3 at 28.7 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSundown Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Sundown Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 1600 W\u003c\/h4\u003e\n\u003cp\u003eThe 34.4 square inch slot beside the woofer is sized so the\n    channel runs 24.9 metres per second and the mouth 16.9 metres per second at the driver's rated power, under the\n    17 metres per second where a slot starts to chuff. The channel runs 9.12 inches along its wall and turns once along the back wall for another 20.70 inches, which is why a 33.5 Hz tuning fits a 15.62 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eEvery driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The M-Series M8 did not clear the port gate there. The calmest wedge port that fits that envelope is 13.0 square inches at 30.0 by 10.50 by 14.78 inches, and its mouth runs 19.6 metres per second at 800 W against the 17 metres per second line where a port starts to chuff. That port would stay clean to about 604 W. The slot on this box reaches 34.4 square inches and holds the mouth at 16.9 metres per second at 1600 W.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 4.24 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 56 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat Sundown Audio recommend\u003c\/h4\u003e\n\u003cp\u003eSundown Audio publish a vented box for the M-Series M8 at 0.65 cubic feet on a basis they do not state, tuned to 35.0 Hz. This cabinet holds 1.79 cubic feet net and tunes to 33.5 Hz. They call for a port area of 9 sq in. The extra air and the lower tuning move the low corner down, which costs a little output right at their tuning and gains it below.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e33.50\" W x 14.00\" H x 15.62\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the M-Series M8's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 16.9 m\/s against the 17 m\/s point where a slot begins to chuff, and 24.9 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for. Sundown Audio does not publish the mounting hole locations for the M-Series M8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 26 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 8.8 mm of its 18.0 mm at 1600 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":44857460326489,"sku":"Pro 8D-P M8","price":488.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_bbab5799-03d9-41c7-a14c-5e8f4ff0f835.jpg?v=1788925436"},{"product_id":"professional-series-ported-dual-8-enclosure-sundown-audio-x-series-v-3-8-x-8","title":"Sundown Audio X-Series v.3 8 Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap 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0}.df-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#a8a29e;margin:0 0 10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of X-Series v.3 8\" X-8, one shared chamber vented at 33.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e2.19 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 33.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 28.4 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the X-Series v.3 8\" X-8\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e2.19\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e33.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e28.4\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e40.6\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 33.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two X-Series v.3 8\" X-8 in 2.195 cubic feet net, vented at 33.0 Hz through a 40.6 square inch port. F3 lands at 28.4 Hz with 3.67 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 18.00 deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e Sundown Audio does not publish the mounting hole locations for the X-Series v.3 8\" X-8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 40.6 square inches of area at 33.0 Hz, and the design power for the velocity and excursion checks is 1600 W for the pair. Passband ripple holds at 3.67 dB across the tuning, with F3 at 28.4 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSundown Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Sundown Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 1600 W\u003c\/h4\u003e\n\u003cp\u003eThe 40.6 square inch slot beside the woofer is sized so the\n    channel runs 23.5 metres per second and the mouth 16.6 metres per second at the driver's rated power, under the\n    17 metres per second where a slot starts to chuff. The channel runs 11.00 inches along its wall and turns once along the back wall for another 17.46 inches, which is why a 33.0 Hz tuning fits a 18.00 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eEvery driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The X-Series v.3 8\" X-8 did not clear the port gate there. The calmest wedge port that fits that envelope is 13.0 square inches at 30.0 by 10.88 by 15.15 inches, and its mouth runs 21.0 metres per second at 800 W against the 17 metres per second line where a port starts to chuff. That port would stay clean to about 524 W. The slot on this box reaches 40.6 square inches and holds the mouth at 16.6 metres per second at 1600 W.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 4.96 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 60 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat Sundown Audio recommend\u003c\/h4\u003e\n\u003cp\u003eSundown Audio publish a vented box for the X-Series v.3 8\" X-8 at 0.75 cubic feet on a basis they do not state, tuned to 32.0 Hz. This cabinet holds 2.19 cubic feet net and tunes to 33.0 Hz. They call for a port area of 12-16 sq in. The extra air lowers the low corner rather than raising output at tuning.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 18.00\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the X-Series v.3 8\" X-8's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 16.6 m\/s against the 17 m\/s point where a slot begins to chuff, and 23.5 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for. Sundown Audio does not publish the mounting hole locations for the X-Series v.3 8\" X-8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 26 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 11.0 mm of its 19.0 mm at 1600 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":44857461964889,"sku":"Pro 8D-P X8","price":534.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_c6ed15e8-98f1-45b0-a75f-1b5b9462f6f0.jpg?v=1788925556"},{"product_id":"professional-series-ported-dual-8-enclosure-nvx-nsw8v3","title":"NVX NSW8v3 Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero p{font-size:1.1em;font-weight:300;opacity:.93;margin:0 0 22px;color:#d6d3d1}.df-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:10px}.df-badge{background:rgba(91,120,255,.18);border:1px solid #5b78ff;color:#99abff;padding:7px 16px;border-radius:18px;font-size:.8em;font-weight:600}.df-stats{display:flex;flex-wrap:wrap;background:#1c1917}.df-stat{flex:1 1 200px;text-align:center;padding:26px 16px;border-right:1px solid #292524;border-bottom:1px solid #292524}.df-stat .n{display:block;font-size:1.6em;font-weight:800;color:#7089ff}.df-stat .l{display:block;font-size:.78em;color:#a8a29e;text-transform:uppercase;letter-spacing:.6px;margin-top:5px}.df-section{padding:42px 36px;border-bottom:1px solid #292524;background:#0c0a09}.df-section:nth-of-type(even){background:#1c1917}.df-section h3{color:#fff;font-size:1.45em;font-weight:700;margin:0 0 14px;border-left:4px solid #5b78ff;padding-left:14px}.df-section p{margin:0 0 14px;color:#d6d3d1}.df-section strong{color:#fff}.df-grid{display:flex;flex-wrap:wrap;gap:18px;margin-top:8px}.df-card{flex:1 1 280px;background:#1c1917;border:1px solid #292524;border-top:3px solid #5b78ff;border-radius:8px;padding:20px 22px}.df-card h4{color:#99abff;margin:0 0 8px;font-size:1.04em}.df-card p{margin:0;font-size:.95em;color:#a8a29e}.df-card strong{color:#fff}.df-highlight{background:#001264;border-left:4px solid #5b78ff;border-radius:0 8px 8px 0;padding:18px 22px;margin:18px 0}.df-highlight p{margin:0;color:#d6d3d1}.df-highlight strong{color:#fff}.df-enc{background:#1c1917;color:#d6d3d1;padding:42px 36px;border-bottom:1px solid #292524}.df-enc h3{color:#fff;font-size:1.45em;font-weight:700;margin:0 0 14px;border-left:4px solid #5b78ff;padding-left:14px}.df-enc p{margin:0 0 14px;color:#d6d3d1}.df-enc-card{background:#292524;border:1px solid #44403c;border-radius:8px;overflow:hidden;margin:18px 0}.df-enc-head{padding:12px 16px;font-size:.82em;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:#99abff;background:#001264}.df-enc-table{width:100%;border-collapse:collapse}.df-enc-table th{background:#0c0a09;color:#a8a29e;font-size:.78em;text-transform:uppercase;letter-spacing:.5px;padding:10px 14px;text-align:left;border-bottom:1px solid #44403c}.df-enc-table td{padding:12px 14px;border-bottom:1px solid #292524;color:#d6d3d1;font-size:.95em}.df-enc-table tr:last-child td{border-bottom:none}.df-opt td{background:#14532d;color:#fff;font-weight:600}.df-char{display:block;font-size:.78em;color:#a8a29e;font-weight:400;margin-top:2px}.df-opt .df-char{color:#86efac}.df-graph{background:#0c0a09;border:1px solid #44403c;border-radius:8px;padding:14px;margin:18px 0}.df-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#a8a29e;margin:0 0 10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of NSW8v3, one shared chamber vented at 34.5 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.46 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 34.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 29.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the NSW8v3\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.46\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e34.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e29.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e28.1\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 34.5 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two NSW8v3 in 1.464 cubic feet net, vented at 34.5 Hz through a 28.1 square inch port. F3 lands at 29.5 Hz with 3.30 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 12.75 deep.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 28.1 square inches of area at 34.5 Hz, and the design power for the velocity and excursion checks is 960 W for the pair. Passband ripple holds at 3.30 dB across the tuning, with F3 at 29.5 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eNVX logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the NVX mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eMounting\u003c\/h4\u003e\n\u003cp\u003eThreaded inserts pressed into the baffle on the published 7.790 inch bolt circle, stainless machine screws included.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 960 W\u003c\/h4\u003e\n\u003cp\u003eThe 28.1 square inch slot beside the woofer is sized so the\n    channel runs 23.1 metres per second and the mouth 14.8 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 6.75 inches along its wall and turns once along the back wall for another 21.79 inches, which is why a 34.5 Hz tuning fits a 12.75 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eA single NSW8v3 also builds in the Performance Optimized ported down-fire, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 960 W for the pair.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 3.51 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 52 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 12.75\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the NSW8v3's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 14.8 m\/s against the 17 m\/s point where a slot begins to chuff, and 23.1 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 27 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 8.3 mm of its 10.5 mm at 960 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47335387398233,"sku":"Pro 8D-P NSW","price":441.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_f0d7f8ab-0fb1-47a4-af2e-87d7563f4d0f.jpg?v=1790455088"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-jl-audio-8w7ae","title":"JL Audio 8W7AE 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 | Dual JL Audio 8W7AE-3\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\"\u003e0.875 ft3 Net per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e1.92 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.80\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eTwo Separate Chambers\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 11\" x 12.83\/16.83\"\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\u003eA Pair of JL Audio 8W7AE-3 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe 8W7AE-3 is the 8 inch of JL Audio's W7AE line: a single 3 ohm voice coil, 500 watts RMS, 19 mm of one-way excursion on 245 square centimeters of cone, and 6.83 inches of mounting depth on a 8.5 inch frame. That motor is deep for an 8, and it sets the shape of this cabinet. Every figure comes from JL Audio's published 8W7AE-3 parameters, and they hold together: Qes and Qms reproduce the printed Qts, and the 100 g moving mass and 0.204 mm\/N compliance reproduce the 35.2 Hz resonance and 17.4 liter Vas.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.875 cubic feet net per chamber on JL's published Fs 35.2 Hz, Qts 0.612 and Vas 17.4 liters: Qtc 0.798, system resonance 45.9 Hz, half power 41.3 Hz. Those are the figures JL prints for its own recommended sealed box, and this cabinet reproduces them. JL's own sealed recommendation for the 8W7AE is 0.875 cubic feet net, and this cabinet is built to it. The maximally flat box on the same figures would be 1.84 cubic feet, more than double, which is a 29 inch wide cabinet for one 8 inch driver.\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 bonded full-height 3\/4 inch MDF divider splits the cabinet into two sealed chambers of 0.875 cubic feet net each, so every driver sees exactly the airspace it would have in the single wedge. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.\u003c\/p\u003e\n\u003cp\u003eThe cabinet is pinned at the 32 inch dual width cap and the ruled 11 inch dual 8 height, so the depth absorbs the airspace: 12.83 inches at the top and 16.83 at the base, deeper than it is tall. Measure the trunk floor before you order. One shared side-mounted terminal cup feeds both driver positions.\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 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 a pair of JL Audio 8W7AE-3\u003c\/h2\u003e\n\u003cp\u003eHalf power lands at 41.3 Hz anechoic, before any cabin gain. JL publishes the driver displacement, 1.7 liters, and it is taken out of the net figure for each driver.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Chamber)\u003c\/h3\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8W7AE-3, single 3 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.798\u003c\/td\u003e\n\u003ctd\u003e45.9 Hz\u003c\/td\u003e\n\u003ctd\u003e41.3 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is cut to 6.94 in (176 mm), JL's published mounting hole, under the 8.5 in (216 mm) frame. The rear panel rakes 20 degrees, so the cavity deepens from 12.83 in at the top to 16.83 in at the base, and the 6.83 in motor clears it with 4.50 in to spare. JL publishes a 7.39 in (188 mm) bolt circle for the 8W7AE, so the threaded inserts are pressed at the shop on that circle and the driver bolts straight down with the stainless machine screws supplied.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhat the Numbers Rest On\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\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eJL's Own Parameters\u003c\/h4\u003e\n\u003cp\u003eFs 35.2 Hz, Qts 0.612, Qes 0.654, Qms 9.5, Vas 17.4 L, Sd 245 cm2, Mms 100 g, Cms 0.204 mm\/N, Bl 9.7 N\/A. Sensitivity 82.7 dB at 1 W \/ 1 m.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring a pair of JL Audio 8W7AE-3 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eEach 8W7AE-3 has a single 3 ohm voice coil. Two in parallel present 1.5 ohms; two in series present 6 ohms. Use 1.5 ohms only if your amplifier is rated stable there; otherwise wire the pair in series for 6 ohms. Confirm the final load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003ePower handling is 500 watts RMS per driver, 1000 across the pair. Aim for roughly 350 to 500 watts per driver at the impedance you wire.\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 with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded inserts pressed on JL's bolt circle, stainless machine screws in the box. 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\u003eDual JL Audio 8W7AE-3: Built to JL's Own Sealed Box\u003c\/h2\u003e\n\u003cp\u003e0.875 cubic feet net per chamber at Qtc 0.798, F3 41.3 Hz, 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":47336470577241,"sku":"PO 8D-S W W7AE BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47336470675545,"sku":"PO 8D-S W W7AE 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_W7AE_Front.jpg?v=1790507704"},{"product_id":"professional-series-ported-dual-8-enclosure-jl-audio-8w7ae-3","title":"JL Audio 8W7AE Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica 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10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of 8W7AE-3, one shared chamber vented at 35.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.32 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 35.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 34.4 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the 8W7AE-3\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.32\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e35.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e34.4\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e25.0\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 35.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two 8W7AE-3 in 1.315 cubic feet net, vented at 35.0 Hz through a 25.0 square inch port. F3 lands at 34.4 Hz with 1.93 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 12.00 deep.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 25.0 square inches of area at 35.0 Hz, and the design power for the velocity and excursion checks is 1200 W for the pair. Passband ripple holds at 1.93 dB across the tuning, with F3 at 34.4 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eJL Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the JL Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eMounting\u003c\/h4\u003e\n\u003cp\u003eThreaded inserts pressed into the baffle on the published 7.390 inch bolt circle, stainless machine screws included.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 1200 W\u003c\/h4\u003e\n\u003cp\u003eThe 25.0 square inch slot beside the woofer is sized so the\n    channel runs 22.4 metres per second and the mouth 13.8 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 6.25 inches along its wall and turns once along the back wall for another 21.34 inches, which is why a 35.0 Hz tuning fits a 12.00 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eA single 8W7AE-3 also builds in the Performance Optimized ported down-fire, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 1200 W for the pair.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 3.31 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 51 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat JL Audio recommend\u003c\/h4\u003e\n\u003cp\u003eJL Audio publish a vented box for the 8W7AE at 1.00 cubic feet net, tuned to 36.8 Hz. This cabinet holds 1.32 cubic feet net and tunes to 35.0 Hz. The extra air and the lower tuning move the low corner down, which costs a little output right at their tuning and gains it below.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 12.00\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the 8W7AE-3's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 13.8 m\/s against the 17 m\/s point where a slot begins to chuff, and 22.4 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 28 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 11.1 mm of its 19.0 mm at 1200 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47336637497433,"sku":"Pro 8D-P W7AE","price":428.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_f4b53fa8-654d-4e3f-8b0e-919ee63098a6.jpg?v=1790508172"},{"product_id":"professional-series-ported-dual-8-enclosure-american-bass-vfl-comp-8","title":"American Bass VFL Comp 8 Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 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10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of VFL Comp 8, one shared chamber vented at 34.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.61 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 34.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 29.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the VFL Comp 8\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.61\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e34.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e29.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e31.2\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 34.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two VFL Comp 8 in 1.609 cubic feet net, vented at 34.0 Hz through a 31.2 square inch port. F3 lands at 29.0 Hz with 4.58 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 14.00 deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e American Bass does not publish the mounting hole locations for the VFL Comp 8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 31.2 square inches of area at 34.0 Hz, and the design power for the velocity and excursion checks is 1440 W for the pair. Passband ripple holds at 4.58 dB across the tuning, with F3 at 29.0 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eAmerican Bass logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the American Bass mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 1440 W\u003c\/h4\u003e\n\u003cp\u003eThe 31.2 square inch slot beside the woofer is sized so the\n    channel runs 25.5 metres per second and the mouth 16.9 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 7.75 inches along its wall and turns once along the back wall for another 21.85 inches, which is why a 34.0 Hz tuning fits a 14.00 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eEvery driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The VFL Comp 8 did not clear the port gate there. The calmest wedge port that fits that envelope is 13.0 square inches at 29.0 by 9.62 by 13.90 inches, and its mouth runs 17.3 metres per second at 600 W against the 17 metres per second line where a port starts to chuff. That port would stay clean to about 576 W. The slot on this box reaches 31.2 square inches and holds the mouth at 16.9 metres per second at 1440 W.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 3.86 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 54 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 14.00\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the VFL Comp 8's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 16.9 m\/s against the 17 m\/s point where a slot begins to chuff, and 25.5 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for. American Bass does not publish the mounting hole locations for the VFL Comp 8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 27 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 9.5 mm of its 13.0 mm at 1440 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47343017459801,"sku":"Pro 8D-P VFLC8","price":464.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_7be30207-64ec-4a39-a6e0-eef80ced4cbb.jpg?v=1790600583"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-ampere-audio-aa-2-0-8","title":"Ampere Audio AA-2.0 8 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 | Dual Ampere Audio AA-2.0 8\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\"\u003e0.38 ft3 Net per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.89 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.64 to 0.77\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eTwo Separate Chambers\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e27.84\" x 11\" x 7.39\/11.39\"\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\u003eA Pair of Ampere Audio AA-2.0 8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe AA-2.0 8 is Ampere's 8 inch in the AA-2.0 series: a steel basket, paper and foam cone, a 2 inch four-layer copper voice coil and a dual 40 ounce magnet, rated 500 watts RMS with 14 mm of one-way excursion, 5.14 inches of mounting depth on an 8.50 inch frame. Every Thiele-Small figure comes from Ampere's own published table for the AA-2.0 8, and the table holds together: the moving mass and resonance reproduce the published Vas on a cone area in class for an 8 inch driver. Ampere prints no cone area for this driver, so the 199 square centimeters used for excursion and output figures is derived from Ampere's own Vas, resonance and moving mass.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.38 cubic feet net per chamber on Ampere's published figures: the dual 2 ohm reads Qtc 0.641 with resonance at 54.1 Hz and half power at 60.2 Hz, and the dual 4 ohm reads Qtc 0.769 with resonance at 53.8 Hz and half power at 49.8 Hz. One cabinet serves both coils, built to the volume that keeps both closest to maximally flat. That is spread either side of maximally flat: the lower-Q coil a little drier, the higher-Q coil a little punchier.\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 bonded full-height 3\/4 inch MDF divider splits the cabinet into two sealed chambers of 0.38 cubic feet net each, so every driver sees exactly the airspace printed on this page. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.\u003c\/p\u003e\n\u003cp\u003eThe cabinet is 27.84 inches wide, 11 tall, 7.39 inches deep at the top and 11.39 at the base; the airspace sets the width. One shared side-mounted terminal cup feeds both driver positions.\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 a pair of Ampere Audio AA-2.0 8\u003c\/h2\u003e\n\u003cp\u003eAnechoic half power lands at 60.2 Hz on the dual 2 ohm and 49.8 Hz on the dual 4 ohm, before any cabin gain. Ampere does not publish driver displacement, so an estimated 0.052 cubic feet per driver is taken out of the net figure.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Chamber)\u003c\/h3\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAA-2.0 8 dual 2 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.641\u003c\/td\u003e\n\u003ctd\u003e54.1 Hz\u003c\/td\u003e\n\u003ctd\u003e60.2 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAA-2.0 8 dual 4 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.769\u003c\/td\u003e\n\u003ctd\u003e53.8 Hz\u003c\/td\u003e\n\u003ctd\u003e49.8 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is cut to 7.20 in, Ampere's published cutout, under the 8.50 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 7.39 in at the top to 11.39 in at the base, and the 5.14 in motor clears it with 0.75 in to spare. Ampere prints no bolt circle for the AA-2.0 8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in the recess, mark its holes, drill, press the inserts and bolt it down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhat the Numbers Rest On\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\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eAmpere's Published Parameters\u003c\/h4\u003e\n\u003cp\u003edual 2 ohm: Fs 43 Hz, Qts 0.51, Qes 0.6, Qms 4.745, Vas 6.26 L, Mms 123.6 g, Bl 13.5 N\/A, Re 3.8 ohm. dual 4 ohm: Fs 42 Hz, Qts 0.6, Qes 0.72, Qms 4.86, Vas 6.91 L, Mms 118 g, Bl 14.84 N\/A, Re 5.8 ohm. Cone area 199 cm2 (derived). Xmax 14 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring a pair of Ampere Audio AA-2.0 8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eAmpere sells the AA-2.0 8 as dual 2 ohm and dual 4 ohm; a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the final load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003ePower handling is 500 watts RMS per driver, 1000 across the pair. Aim for roughly 350 to 500 watts per driver at the impedance you wire.\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 with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded insert kit and stainless machine screws in the box. 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\u003eDual Ampere Audio AA-2.0 8: Cut for One Driver\u003c\/h2\u003e\n\u003cp\u003e0.38 cubic feet net per chamber at Qtc 0.64 to 0.77, F3 60.2 Hz on the dual 2 ohm and 49.8 Hz on the dual 4 ohm, 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":47379331416153,"sku":"PO 8D-S W AA2 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47379331448921,"sku":"PO 8D-S W AA2 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_AA2_Front.jpg?v=1791173204"},{"product_id":"performance-optimized-down-fire-sealed-dual-8-enclosure-ampere-audio-aa-2-0-8","title":"Ampere Audio AA-2.0 8 Dual Box: Sealed 8\" Down Fire 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class=\"df-hero\"\u003e\n\u003ch2\u003eProline X Performance Optimized Down Fire Dual 8\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of Ampere Audio AA-2.0 8\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003e0.81 cu ft Net Total\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eSeparate Chambers\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eStandoffs Included\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stats\"\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.41\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.63-0.76\u003c\/span\u003e\u003cspan class=\"l\"\u003esystem Qtc per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e49.7 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff, anechoic, lowest coil\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e6.64 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height, excludes standoffs\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePerformance, Performance Optimized, and Micro\u003c\/h3\u003e\n\u003cp\u003eProline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.\u003c\/p\u003e\n\u003cdiv class=\"df-tier\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003cth class=\"on\"\u003ePerformance Optimized\u003c\/th\u003e\n\u003cth\u003eMicro Series\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal. Accepts any subwoofer that clears the published cutout and mounting depth.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eWoofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.\u003c\/td\u003e\n\u003ctd\u003eWoofer specific. Cut for one named subwoofer.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFootprint\u003c\/td\u003e\n\u003ctd\u003eSized to the driver diameter.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA shared 30 by 15 inch platform, with cabinet height as the variable. This build sits on that platform at 6.64 inches tall, the height its 5.14 inch motor needs.\u003c\/td\u003e\n\u003ctd\u003eCompact per driver footprint.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFront baffle\u003c\/td\u003e\n\u003ctd\u003eSingle, 3\/4 inch.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eDouble, 1.5 inch, outer layer machined as a flush recess.\u003c\/td\u003e\n\u003ctd\u003eDouble, 1.5 inch.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eDriver mounting\u003c\/td\u003e\n\u003ctd\u003eSolid flange. You drill your own mounting holes.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eThreaded insert kit and stainless machine screws included; Ampere prints no bolt circle, so you mark and drill from the driver.\u003c\/td\u003e\n\u003ctd\u003eThreaded inserts, stainless machine screws included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eJoinery\u003c\/td\u003e\n\u003ctd\u003eV-groove and dado, CNC cut.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eV-groove and dado, CNC cut, full-height divider and perimeter cross brace.\u003c\/td\u003e\n\u003ctd\u003eStack fab, dowel reinforced.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003ePublished alignment\u003c\/td\u003e\n\u003ctd\u003eModeled Qtc profiles across a range of drivers. No single response curve.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.\u003c\/td\u003e\n\u003ctd\u003eTarget alignment described in the listing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eCarpet\u003c\/td\u003e\n\u003ctd\u003eGray standard, black optional.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003ePlush black.\u003c\/td\u003e\n\u003ctd\u003ePlush black.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 year limited.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003e1 year limited.\u003c\/td\u003e\n\u003ctd\u003e2 years.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eFeet ship with every tier, uninstalled on purpose.\u003c\/strong\u003e Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eThis page is a Performance Optimized enclosure.\u003c\/strong\u003e The airspace, the cutout and the cabinet height all come from the driver's own numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Pair of Ampere Audio AA-2.0 8\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. The baffle is cut to 7.20 in, Ampere's published cutout, under the 8.50 in frame. The airspace lands on \u003cstrong\u003e0.41 cubic feet net per chamber\u003c\/strong\u003e, the volume the cabinet reaches at the height the 5.14 inch motor requires.\u003c\/p\u003e\n\u003cp\u003eThe AA-2.0 8 is Ampere's 8 inch in the AA-2.0 series: a steel basket, paper and foam cone, a 2 inch four-layer copper voice coil and a dual 40 ounce magnet, rated 500 watts RMS with 14 mm of one-way excursion, 5.14 inches of mounting depth on an 8.50 inch frame. It sits 5.14 inches deep, which matters on a down fire, where the motor rises into the cabinet. Every Thiele-Small figure comes from Ampere's own published table for the AA-2.0 8, and the table holds together: the moving mass and resonance reproduce the published Vas on a cone area in class for an 8 inch driver. Ampere prints no cone area for this driver, so the 199 square centimeters used for excursion and output figures is derived from Ampere's own Vas, resonance and moving mass.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eTwo Chambers, Not One Volume\u003c\/h3\u003e\n\u003cp\u003eThis enclosure follows the Proline X standing rule for dual sealed builds: \u003cstrong\u003etwo fully separate chambers\u003c\/strong\u003e split by a bonded full height 3\/4 inch MDF divider, each driver in its own 0.41 cubic feet with its own polyfill.\u003c\/p\u003e\n\u003cp\u003eTwo drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment either would have on its own. A full divider removes that entirely. One shared side mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eEach chamber is built at \u003cstrong\u003e0.41 cubic feet net per driver\u003c\/strong\u003e, out of 0.94 gross after the divider and the drivers. Ampere does not publish driver displacement, so an estimated 0.052 cubic feet per driver is taken out of the net figure. The 5.14 inch mounting depth sets this cabinet's minimum height on the 30 by 15 platform, and the airspace comes with it.\u003c\/p\u003e\n\u003cdiv class=\"df-highlight\"\u003e\u003cp\u003e\u003cstrong\u003eTrue net, not marketing net.\u003c\/strong\u003e Internal volume is calculated from the machined cavity dimensions and the driver's displacement, not guessed from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003e0.41 cubic feet net per chamber on Ampere's published figures: the dual 2 ohm reads Qtc 0.634 with resonance at 53.4 Hz and half power at 60.3 Hz, and the dual 4 ohm reads Qtc 0.759 with resonance at 53.1 Hz and half power at 49.7 Hz. One cabinet serves both coils, built to the volume that keeps both closest to maximally flat. That is spread either side of maximally flat: the lower-Q coil a little drier, the higher-Q coil a little punchier.\u003c\/p\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAA-2.0 8 dual 2 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.634\u003c\/td\u003e\n\u003ctd\u003e53.4 Hz\u003c\/td\u003e\n\u003ctd\u003e60.3 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAA-2.0 8 dual 4 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.759\u003c\/td\u003e\n\u003ctd\u003e53.1 Hz\u003c\/td\u003e\n\u003ctd\u003e49.7 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eDown Fire Construction\u003c\/h3\u003e\n\u003cp\u003eCut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3\/4 inch MDF. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.\u003c\/p\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e30.00 inches wide by 15.00 inches deep by 6.64 inches tall, measured in the down fire position and excluding standoffs\u003c\/strong\u003e. Plan the space around the installed height rather than the cabinet height: the standoffs hold 1.75 inches under the baffle, so the finished stack sits near \u003cstrong\u003e8.39 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv class=\"df-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDouble Baffle, Flush Recess\u003c\/h4\u003e\n\u003cp\u003eThe front baffle is \u003cstrong\u003e1.5 inches\u003c\/strong\u003e, two bonded 3\/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSide-Mounted Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in \u003cstrong\u003e12 gauge OFC\u003c\/strong\u003e to both driver positions. Side mounted so it stays accessible with the baffle facing the floor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eStandoffs Included\u003c\/h4\u003e\n\u003cp\u003eAmpere publishes no front clearance figure for the AA-2.0 8, so this cabinet uses the Proline X standard \u003cstrong\u003e1.75 inch\u003c\/strong\u003e standoff, shipped with every enclosure and left uninstalled so you can place them to suit your floor. At that height the floor slot is 1.28 times the cone area, enough for the AA-2.0 8.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eMotor Clearance and Orientation\u003c\/h3\u003e\n\u003cp\u003eThe motors rise off the baffle into the cavity, so on a down fire cabinet the clearance that matters runs to the top panel. The 5.14 inch mounting depth puts the motor 3.64 inches into a 4.39 inch cavity, leaving \u003cstrong\u003e0.75 inches above the motor\u003c\/strong\u003e against a 0.75 inch minimum. Height was set by that clearance, not by the airspace: the volume alone would have allowed a lower box.\u003c\/p\u003e\n\u003cp\u003eAmpere does not publish a position on down firing this driver, and this cabinet makes no claim on their behalf. The feet ship uninstalled, so if you would rather run it front firing or up firing, that is a decision you can make at install time without changing anything about the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePower, Mounting and Warranty\u003c\/h3\u003e\n\u003cp\u003eAmpere rates the AA-2.0 8 at \u003cstrong\u003e500 watts RMS\u003c\/strong\u003e, 1000 watts RMS combined. Ampere sells the AA-2.0 8 as dual 2 ohm and dual 4 ohm; a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003eAmpere prints no bolt circle for the AA-2.0 8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in the recess, mark its holes, drill, press the inserts and bolt it down. The enclosure carries a 1 year limited warranty. Bring your own pair of AA-2.0 8; the drivers are purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eCut for the Driver, Not the Catalog\u003c\/h3\u003e\n\u003cp\u003eBuilt one at a time in Tullahoma, Tennessee, with standoffs and a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47379331874905,"sku":"PO 8D-S DF AA2","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_AA2_Front.jpg?v=1791173240"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-ampere-audio-aa-2-75-8","title":"Ampere Audio AA-2.75 8 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 | Dual Ampere Audio AA-2.75 8\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\"\u003e0.30 ft3 Net per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.76 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.66\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eTwo Separate Chambers\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e20.57\" x 11\" x 8.67\/12.67\"\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\u003eA Pair of Ampere Audio AA-2.75 8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe AA-2.75 8 is Ampere's 8 inch in the AA-2.75 series: a cast aluminum basket, a 2.5 inch four-layer copper voice coil, a three-layer progressive spider pack and a dual 80 ounce motor, rated 800 watts RMS with 19 mm of one-way excursion, 6.42 inches of mounting depth on an 8.66 inch frame. Every Thiele-Small figure comes from Ampere's own published table for the AA-2.75 8, and the table holds together: the moving mass and resonance reproduce the published Vas on a cone area in class for an 8 inch driver. One cell in Ampere's table is wrong: the cone area is printed as 130 square centimeters, but Ampere's own Vas and compliance put it at 200, which is in class for an 8 inch cone, and that figure is used here.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.30 cubic feet net per chamber on Ampere's published figures: the dual 4 ohm reads Qtc 0.657 with resonance at 55.1 Hz and half power at 59.7 Hz. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top. This cabinet is listed for the AA-2.75 8 dual 4 ohm only. Ampere's dual 2 ohm version reads Qtc 0.60 in the same airspace, too damped to sound right sealed, so it is not offered in this enclosure.\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 bonded full-height 3\/4 inch MDF divider splits the cabinet into two sealed chambers of 0.30 cubic feet net each, so every driver sees exactly the airspace printed on this page. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.\u003c\/p\u003e\n\u003cp\u003eThe cabinet is 20.57 inches wide, 11 tall, 8.67 inches deep at the top and 12.67 at the base; the width is set by two 8.66 inch frames side by side. One shared side-mounted terminal cup feeds both driver positions.\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 a pair of Ampere Audio AA-2.75 8\u003c\/h2\u003e\n\u003cp\u003eAnechoic half power lands at 59.7 Hz, before any cabin gain. Ampere does not publish driver displacement, so an estimated 0.066 cubic feet per driver is taken out of the net figure.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Chamber)\u003c\/h3\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAA-2.75 8 dual 4 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.657\u003c\/td\u003e\n\u003ctd\u003e55.1 Hz\u003c\/td\u003e\n\u003ctd\u003e59.7 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is cut to 7.28 in, Ampere's published cutout, under the 8.66 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 8.67 in at the top to 12.67 in at the base, and the 6.42 in motor clears it with 0.75 in to spare. Ampere prints no bolt circle for the AA-2.75 8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in the recess, mark its holes, drill, press the inserts and bolt it down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhat the Numbers Rest On\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\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eAmpere's Published Parameters\u003c\/h4\u003e\n\u003cp\u003edual 4 ohm: Fs 47 Hz, Qts 0.56, Qes 0.65, Qms 4.63, Vas 3.19 L, Mms 206.4 g, Bl 24.71 N\/A, Re 7 ohm. Cone area 200 cm2 (derived). Xmax 19 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring a pair of Ampere Audio AA-2.75 8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThis cabinet is for the AA-2.75 8 dual 4 ohm; a matched pair should share a coil. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the final load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003ePower handling is 800 watts RMS per driver, 1600 across the pair. Aim for roughly 560 to 800 watts per driver at the impedance you wire.\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 with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded insert kit and stainless machine screws in the box. 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\u003eDual Ampere Audio AA-2.75 8: Cut for One Driver\u003c\/h2\u003e\n\u003cp\u003e0.30 cubic feet net per chamber at Qtc 0.66, F3 59.7 Hz, 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":47379332956249,"sku":"PO 8D-S W AA275 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47379332989017,"sku":"PO 8D-S W AA275 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_AA275_Front.jpg?v=1791173448"},{"product_id":"performance-optimized-down-fire-sealed-dual-8-enclosure-ampere-audio-aa-2-75-8","title":"Ampere Audio AA-2.75 8 Dual Box: Sealed 8\" Down Fire Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica 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10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#3d2412;color:#e8b98d}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(184,115,51,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\u003cdiv class=\"df-hero\"\u003e\n\u003ch2\u003eProline X Performance Optimized Down Fire Dual 8\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of Ampere Audio AA-2.75 8\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003e1.05 cu ft Net Total\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eSeparate Chambers\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eStandoffs Included\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stats\"\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.53\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.617\u003c\/span\u003e\u003cspan class=\"l\"\u003esystem Qtc per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e60.4 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff, anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e7.92 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height, excludes standoffs\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePerformance, Performance Optimized, and Micro\u003c\/h3\u003e\n\u003cp\u003eProline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.\u003c\/p\u003e\n\u003cdiv class=\"df-tier\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003cth class=\"on\"\u003ePerformance Optimized\u003c\/th\u003e\n\u003cth\u003eMicro Series\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal. Accepts any subwoofer that clears the published cutout and mounting depth.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eWoofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.\u003c\/td\u003e\n\u003ctd\u003eWoofer specific. Cut for one named subwoofer.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFootprint\u003c\/td\u003e\n\u003ctd\u003eSized to the driver diameter.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA shared 30 by 15 inch platform, with cabinet height as the variable. This build sits on that platform at 7.92 inches tall, the height its 6.42 inch motor needs.\u003c\/td\u003e\n\u003ctd\u003eCompact per driver footprint.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFront baffle\u003c\/td\u003e\n\u003ctd\u003eSingle, 3\/4 inch.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eDouble, 1.5 inch, outer layer machined as a flush recess.\u003c\/td\u003e\n\u003ctd\u003eDouble, 1.5 inch.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eDriver mounting\u003c\/td\u003e\n\u003ctd\u003eSolid flange. You drill your own mounting holes.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eThreaded insert kit and stainless machine screws included; Ampere prints no bolt circle, so you mark and drill from the driver.\u003c\/td\u003e\n\u003ctd\u003eThreaded inserts, stainless machine screws included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eJoinery\u003c\/td\u003e\n\u003ctd\u003eV-groove and dado, CNC cut.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eV-groove and dado, CNC cut, full-height divider and perimeter cross brace.\u003c\/td\u003e\n\u003ctd\u003eStack fab, dowel reinforced.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003ePublished alignment\u003c\/td\u003e\n\u003ctd\u003eModeled Qtc profiles across a range of drivers. No single response curve.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.\u003c\/td\u003e\n\u003ctd\u003eTarget alignment described in the listing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eCarpet\u003c\/td\u003e\n\u003ctd\u003eGray standard, black optional.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003ePlush black.\u003c\/td\u003e\n\u003ctd\u003ePlush black.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 year limited.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003e1 year limited.\u003c\/td\u003e\n\u003ctd\u003e2 years.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eFeet ship with every tier, uninstalled on purpose.\u003c\/strong\u003e Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eThis page is a Performance Optimized enclosure.\u003c\/strong\u003e The airspace, the cutout and the cabinet height all come from the driver's own numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Pair of Ampere Audio AA-2.75 8\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. The baffle is cut to 7.28 in, Ampere's published cutout, under the 8.66 in frame. The airspace lands on \u003cstrong\u003e0.53 cubic feet net per chamber\u003c\/strong\u003e, the volume the cabinet reaches at the height the 6.42 inch motor requires.\u003c\/p\u003e\n\u003cp\u003eThe AA-2.75 8 is Ampere's 8 inch in the AA-2.75 series: a cast aluminum basket, a 2.5 inch four-layer copper voice coil, a three-layer progressive spider pack and a dual 80 ounce motor, rated 800 watts RMS with 19 mm of one-way excursion, 6.42 inches of mounting depth on an 8.66 inch frame. It sits 6.42 inches deep, which matters on a down fire, where the motor rises into the cabinet. Every Thiele-Small figure comes from Ampere's own published table for the AA-2.75 8, and the table holds together: the moving mass and resonance reproduce the published Vas on a cone area in class for an 8 inch driver. One cell in Ampere's table is wrong: the cone area is printed as 130 square centimeters, but Ampere's own Vas and compliance put it at 200, which is in class for an 8 inch cone, and that figure is used here.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eTwo Chambers, Not One Volume\u003c\/h3\u003e\n\u003cp\u003eThis enclosure follows the Proline X standing rule for dual sealed builds: \u003cstrong\u003etwo fully separate chambers\u003c\/strong\u003e split by a bonded full height 3\/4 inch MDF divider, each driver in its own 0.53 cubic feet with its own polyfill.\u003c\/p\u003e\n\u003cp\u003eTwo drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment either would have on its own. A full divider removes that entirely. One shared side mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eEach chamber is built at \u003cstrong\u003e0.53 cubic feet net per driver\u003c\/strong\u003e, out of 1.22 gross after the divider and the drivers. Ampere does not publish driver displacement, so an estimated 0.066 cubic feet per driver is taken out of the net figure. The 6.42 inch mounting depth sets this cabinet's minimum height on the 30 by 15 platform, and the airspace comes with it.\u003c\/p\u003e\n\u003cdiv class=\"df-highlight\"\u003e\u003cp\u003e\u003cstrong\u003eTrue net, not marketing net.\u003c\/strong\u003e Internal volume is calculated from the machined cavity dimensions and the driver's displacement, not guessed from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003e0.53 cubic feet net per chamber on Ampere's published figures: the dual 4 ohm reads Qtc 0.617 with resonance at 51.8 Hz and half power at 60.4 Hz. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top. This cabinet is listed for the AA-2.75 8 dual 4 ohm only. Ampere's dual 2 ohm version reads Qtc 0.56 in the same airspace, too damped to sound right sealed, so it is not offered in this enclosure.\u003c\/p\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAA-2.75 8 dual 4 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.617\u003c\/td\u003e\n\u003ctd\u003e51.8 Hz\u003c\/td\u003e\n\u003ctd\u003e60.4 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eDown Fire Construction\u003c\/h3\u003e\n\u003cp\u003eCut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3\/4 inch MDF. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.\u003c\/p\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e30.00 inches wide by 15.00 inches deep by 7.92 inches tall, measured in the down fire position and excluding standoffs\u003c\/strong\u003e. Plan the space around the installed height rather than the cabinet height: the standoffs hold 1.75 inches under the baffle, so the finished stack sits near \u003cstrong\u003e9.67 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv class=\"df-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDouble Baffle, Flush Recess\u003c\/h4\u003e\n\u003cp\u003eThe front baffle is \u003cstrong\u003e1.5 inches\u003c\/strong\u003e, two bonded 3\/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSide-Mounted Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in \u003cstrong\u003e12 gauge OFC\u003c\/strong\u003e to both driver positions. Side mounted so it stays accessible with the baffle facing the floor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eStandoffs Included\u003c\/h4\u003e\n\u003cp\u003eAmpere publishes no front clearance figure for the AA-2.75 8, so this cabinet uses the Proline X standard \u003cstrong\u003e1.75 inch\u003c\/strong\u003e standoff, shipped with every enclosure and left uninstalled so you can place them to suit your floor. At that height the floor slot is 1.29 times the cone area, enough for the AA-2.75 8.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eMotor Clearance and Orientation\u003c\/h3\u003e\n\u003cp\u003eThe motors rise off the baffle into the cavity, so on a down fire cabinet the clearance that matters runs to the top panel. The 6.42 inch mounting depth puts the motor 4.92 inches into a 5.67 inch cavity, leaving \u003cstrong\u003e0.75 inches above the motor\u003c\/strong\u003e against a 0.75 inch minimum. Height was set by that clearance, not by the airspace: the volume alone would have allowed a lower box.\u003c\/p\u003e\n\u003cp\u003eAmpere does not publish a position on down firing this driver, and this cabinet makes no claim on their behalf. The feet ship uninstalled, so if you would rather run it front firing or up firing, that is a decision you can make at install time without changing anything about the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePower, Mounting and Warranty\u003c\/h3\u003e\n\u003cp\u003eAmpere rates the AA-2.75 8 at \u003cstrong\u003e800 watts RMS\u003c\/strong\u003e, 1600 watts RMS combined. This cabinet is for the AA-2.75 8 dual 4 ohm; a matched pair should share a coil. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003eAmpere prints no bolt circle for the AA-2.75 8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in the recess, mark its holes, drill, press the inserts and bolt it down. The enclosure carries a 1 year limited warranty. Bring your own pair of AA-2.75 8; the drivers are purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eCut for the Driver, Not the Catalog\u003c\/h3\u003e\n\u003cp\u003eBuilt one at a time in Tullahoma, Tennessee, with standoffs and a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47379333054553,"sku":"PO 8D-S DF AA275","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_AA275_Front.jpg?v=1791173462"},{"product_id":"professional-series-ported-dual-8-enclosure-ampere-audio-aa-2-75-8","title":"Ampere Audio AA-2.75 8 Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero 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14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of AA-2.75 8, one shared chamber vented at 33.5 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e2.24 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 33.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 28.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the AA-2.75 8\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e2.24\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e33.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e28.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e43.8\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 33.5 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two AA-2.75 8 in 2.239 cubic feet net, vented at 33.5 Hz through a 43.8 square inch port. F3 lands at 28.5 Hz with 4.76 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 18.00 deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e Ampere Audio does not publish the mounting hole locations for the AA-2.75 8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 43.8 square inches of area at 33.5 Hz, and the design power for the velocity and excursion checks is 1920 W for the pair. Passband ripple holds at 4.76 dB across the tuning, with F3 at 28.5 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eAmpere Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Ampere Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 1920 W\u003c\/h4\u003e\n\u003cp\u003eThe 43.8 square inch slot beside the woofer is sized so the\n    channel runs 23.3 metres per second and the mouth 16.8 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 10.75 inches along its wall and turns once along the back wall for another 18.30 inches, which is why a 33.5 Hz tuning fits a 18.00 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eEvery driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The AA-2.75 8 did not clear the port gate there. The calmest wedge port that fits that envelope is 13.0 square inches at 30.0 by 10.38 by 14.65 inches, and its mouth runs 19.8 metres per second at 800 W against the 17 metres per second line where a port starts to chuff. That port would stay clean to about 588 W. The slot on this box reaches 43.8 square inches and holds the mouth at 16.8 metres per second at 1920 W.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 4.96 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 60 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 18.00\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the AA-2.75 8's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 16.8 m\/s against the 17 m\/s point where a slot begins to chuff, and 23.3 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for. Ampere Audio does not publish the mounting hole locations for the AA-2.75 8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 26 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 11.2 mm of its 19.0 mm at 1920 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47379445612633,"sku":"Pro 8D-P AA275","price":534.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_678bc310-2a78-4461-a0c7-8fdf76b337e8.jpg?v=1791176937"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-musway-mg8","title":"Musway MG8 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 | Dual Musway MG8\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\"\u003e0.28 ft3 Net per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.70 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.65\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eTwo Separate Chambers\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e21.67\" x 11\" x 7.68\/11.69\"\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\u003eA Pair of Musway MG8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe MG8 is Musway's 8 inch in the MG line, dual 2 ohm, rated 300 watts RMS with 19 mm of one-way excursion, 5.43 inches of mounting depth on an 8.70 inch frame. Every Thiele-Small figure comes from Musway's own published table for the MG8, and the table holds together: the moving mass and resonance reproduce the published Vas on Musway's own 207 square centimeter cone area.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.28 cubic feet net per chamber on Musway's published figures: the dual 2 ohm reads Qtc 0.651 with resonance at 68.0 Hz and half power at 74.4 Hz. The volume is Musway's own minimum recommended sealed airspace for the MG8, 8 litres, which keeps this high-resonance 8 inch the best damped it can be sealed. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top.\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 bonded full-height 3\/4 inch MDF divider splits the cabinet into two sealed chambers of 0.28 cubic feet net each, so every driver sees exactly the airspace printed on this page. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.\u003c\/p\u003e\n\u003cp\u003eThe cabinet is 21.67 inches wide, 11 tall, 7.68 inches deep at the top and 11.69 at the base; the airspace sets the width. One shared side-mounted terminal cup feeds both driver positions.\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 a pair of Musway MG8\u003c\/h2\u003e\n\u003cp\u003eAnechoic half power lands at 74.4 Hz, before any cabin gain. Musway does not publish driver displacement, so an estimated 0.056 cubic feet per driver is taken out of the net figure.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Chamber)\u003c\/h3\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMG8 dual 2 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.651\u003c\/td\u003e\n\u003ctd\u003e68.0 Hz\u003c\/td\u003e\n\u003ctd\u003e74.4 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is cut to 7.28 in, Musway's published cutout, under the 8.70 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 7.68 in at the top to 11.69 in at the base, and the 5.43 in motor clears it with 0.75 in to spare. Musway prints no bolt circle for the MG8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in the recess, mark its holes, drill, press the inserts and bolt it down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhat the Numbers Rest On\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\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eMusway's Published Parameters\u003c\/h4\u003e\n\u003cp\u003edual 2 ohm: Fs 46 Hz, Qts 0.44, Qes 0.49, Qms 3.89, Vas 9.5 L, Mms 75.6 g, Re 2 x 1.8 ohm. Cone area 207 cm2. Xmax 19 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring a pair of Musway MG8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eMusway sells the MG8 as dual 2 ohm; a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the final load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS per driver, 600 across the pair. Aim for roughly 210 to 300 watts per driver at the impedance you wire.\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 with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded insert kit and stainless machine screws in the box. 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\u003eDual Musway MG8: Cut for One Driver\u003c\/h2\u003e\n\u003cp\u003e0.28 cubic feet net per chamber at Qtc 0.65, F3 74.4 Hz, 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":47407450488921,"sku":"PO 8D-S W MG8 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47407450587225,"sku":"PO 8D-S W MG8 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_MG8_Front.jpg?v=1791569550"},{"product_id":"performance-optimized-down-fire-sealed-dual-8-enclosure-musway-mg8","title":"Musway MG8 Dual Box: Sealed 8\" Down Fire Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica 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10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#3d2412;color:#e8b98d}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(184,115,51,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\u003cdiv class=\"df-hero\"\u003e\n\u003ch2\u003eProline X Performance Optimized Down Fire Dual 8\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of Musway MG8\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003e0.87 cu ft Net Total\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eSeparate Chambers\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eStandoffs Included\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stats\"\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.43\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.586\u003c\/span\u003e\u003cspan class=\"l\"\u003esystem Qtc per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e76.4 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff, anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e6.93 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height, excludes standoffs\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePerformance, Performance Optimized, and Micro\u003c\/h3\u003e\n\u003cp\u003eProline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.\u003c\/p\u003e\n\u003cdiv class=\"df-tier\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003cth class=\"on\"\u003ePerformance Optimized\u003c\/th\u003e\n\u003cth\u003eMicro Series\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal. Accepts any subwoofer that clears the published cutout and mounting depth.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eWoofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.\u003c\/td\u003e\n\u003ctd\u003eWoofer specific. Cut for one named subwoofer.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFootprint\u003c\/td\u003e\n\u003ctd\u003eSized to the driver diameter.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA shared 30 by 15 inch platform, with cabinet height as the variable. This build sits on that platform at 6.93 inches tall, the height its 5.43 inch motor needs.\u003c\/td\u003e\n\u003ctd\u003eCompact per driver footprint.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFront baffle\u003c\/td\u003e\n\u003ctd\u003eSingle, 3\/4 inch.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eDouble, 1.5 inch, outer layer machined as a flush recess.\u003c\/td\u003e\n\u003ctd\u003eDouble, 1.5 inch.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eDriver mounting\u003c\/td\u003e\n\u003ctd\u003eSolid flange. You drill your own mounting holes.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eThreaded insert kit and stainless machine screws included; Musway prints no bolt circle, so you mark and drill from the driver.\u003c\/td\u003e\n\u003ctd\u003eThreaded inserts, stainless machine screws included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eJoinery\u003c\/td\u003e\n\u003ctd\u003eV-groove and dado, CNC cut.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eV-groove and dado, CNC cut, full-height divider and perimeter cross brace.\u003c\/td\u003e\n\u003ctd\u003eStack fab, dowel reinforced.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003ePublished alignment\u003c\/td\u003e\n\u003ctd\u003eModeled Qtc profiles across a range of drivers. No single response curve.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.\u003c\/td\u003e\n\u003ctd\u003eTarget alignment described in the listing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eCarpet\u003c\/td\u003e\n\u003ctd\u003eGray standard, black optional.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003ePlush black.\u003c\/td\u003e\n\u003ctd\u003ePlush black.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 year limited.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003e1 year limited.\u003c\/td\u003e\n\u003ctd\u003e2 years.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eFeet ship with every tier, uninstalled on purpose.\u003c\/strong\u003e Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eThis page is a Performance Optimized enclosure.\u003c\/strong\u003e The airspace, the cutout and the cabinet height all come from the driver's own numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Pair of Musway MG8\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. The baffle is cut to 7.28 in, Musway's published cutout, under the 8.70 in frame. The airspace lands on \u003cstrong\u003e0.43 cubic feet net per chamber\u003c\/strong\u003e, the volume the cabinet reaches at the height the 5.43 inch motor requires.\u003c\/p\u003e\n\u003cp\u003eThe MG8 is Musway's 8 inch in the MG line, dual 2 ohm, rated 300 watts RMS with 19 mm of one-way excursion, 5.43 inches of mounting depth on an 8.70 inch frame. It sits 5.43 inches deep, which matters on a down fire, where the motor rises into the cabinet. Every Thiele-Small figure comes from Musway's own published table for the MG8, and the table holds together: the moving mass and resonance reproduce the published Vas on Musway's own 207 square centimeter cone area.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eTwo Chambers, Not One Volume\u003c\/h3\u003e\n\u003cp\u003eThis enclosure follows the Proline X standing rule for dual sealed builds: \u003cstrong\u003etwo fully separate chambers\u003c\/strong\u003e split by a bonded full height 3\/4 inch MDF divider, each driver in its own 0.43 cubic feet with its own polyfill.\u003c\/p\u003e\n\u003cp\u003eTwo drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment either would have on its own. A full divider removes that entirely. One shared side mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eEach chamber is built at \u003cstrong\u003e0.43 cubic feet net per driver\u003c\/strong\u003e, out of 1.01 gross after the divider and the drivers. Musway does not publish driver displacement, so an estimated 0.056 cubic feet per driver is taken out of the net figure. The 5.43 inch mounting depth sets this cabinet's minimum height on the 30 by 15 platform, and the airspace comes with it.\u003c\/p\u003e\n\u003cdiv class=\"df-highlight\"\u003e\u003cp\u003e\u003cstrong\u003eTrue net, not marketing net.\u003c\/strong\u003e Internal volume is calculated from the machined cavity dimensions and the driver's displacement, not guessed from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003e0.43 cubic feet net per chamber on Musway's published figures: the dual 2 ohm reads Qtc 0.586 with resonance at 61.3 Hz and half power at 76.4 Hz. The motor sets this down fire's height, and that height holds more air than the 0.28 cubic feet the volume alone called for. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top.\u003c\/p\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMG8 dual 2 ohm\u003c\/td\u003e\n\u003ctd\u003eQtc 0.586\u003c\/td\u003e\n\u003ctd\u003e61.3 Hz\u003c\/td\u003e\n\u003ctd\u003e76.4 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eDown Fire Construction\u003c\/h3\u003e\n\u003cp\u003eCut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3\/4 inch MDF. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.\u003c\/p\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e30.00 inches wide by 15.00 inches deep by 6.93 inches tall, measured in the down fire position and excluding standoffs\u003c\/strong\u003e. Plan the space around the installed height rather than the cabinet height: the standoffs hold 1.75 inches under the baffle, so the finished stack sits near \u003cstrong\u003e8.68 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv class=\"df-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDouble Baffle, Flush Recess\u003c\/h4\u003e\n\u003cp\u003eThe front baffle is \u003cstrong\u003e1.5 inches\u003c\/strong\u003e, two bonded 3\/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSide-Mounted Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in \u003cstrong\u003e12 gauge OFC\u003c\/strong\u003e to both driver positions. Side mounted so it stays accessible with the baffle facing the floor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eStandoffs Included\u003c\/h4\u003e\n\u003cp\u003eMusway publishes no front clearance figure for the MG8, so this cabinet uses the Proline X standard \u003cstrong\u003e1.75 inch\u003c\/strong\u003e standoff, shipped with every enclosure and left uninstalled so you can place them to suit your floor. At that height the floor slot is 1.25 times the cone area, enough for the MG8.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eMotor Clearance and Orientation\u003c\/h3\u003e\n\u003cp\u003eThe motors rise off the baffle into the cavity, so on a down fire cabinet the clearance that matters runs to the top panel. The 5.43 inch mounting depth puts the motor 3.93 inches into a 4.68 inch cavity, leaving \u003cstrong\u003e0.75 inches above the motor\u003c\/strong\u003e against a 0.75 inch minimum. Height was set by that clearance, not by the airspace: the volume alone would have allowed a lower box.\u003c\/p\u003e\n\u003cp\u003eMusway does not publish a position on down firing this driver, and this cabinet makes no claim on their behalf. The feet ship uninstalled, so if you would rather run it front firing or up firing, that is a decision you can make at install time without changing anything about the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePower, Mounting and Warranty\u003c\/h3\u003e\n\u003cp\u003eMusway rates the MG8 at \u003cstrong\u003e300 watts RMS\u003c\/strong\u003e, 600 watts RMS combined. Musway sells the MG8 as dual 2 ohm; a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003eMusway prints no bolt circle for the MG8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in the recess, mark its holes, drill, press the inserts and bolt it down. The enclosure carries a 1 year limited warranty. Bring your own pair of MG8; the drivers are purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eCut for the Driver, Not the Catalog\u003c\/h3\u003e\n\u003cp\u003eBuilt one at a time in Tullahoma, Tennessee, with standoffs and a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47407452323929,"sku":"PO 8D-S DF MG8","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_MG8_Front.jpg?v=1791569565"},{"product_id":"performance-optimized-down-fire-sealed-dual-8-enclosure-dayton-audio-reference-rss210ho","title":"Dayton Audio Reference RSS210HO Dual Box: Sealed 8\" Down Fire Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#5c3317 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 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14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#3d2412;color:#e8b98d}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(184,115,51,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\u003cdiv class=\"df-hero\"\u003e\n\u003ch2\u003eProline X Performance Optimized Down Fire Dual 8\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of Dayton Audio Reference RSS210HO\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003e0.78 cu ft Net Total\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eSeparate Chambers\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eStandoffs Included\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stats\"\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.39\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.64-0.66\u003c\/span\u003e\u003cspan class=\"l\"\u003esystem Qtc per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e52.6 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff, anechoic, lowest coil\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e6.46 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height, excludes standoffs\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePerformance, Performance Optimized, and Micro\u003c\/h3\u003e\n\u003cp\u003eProline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.\u003c\/p\u003e\n\u003cdiv class=\"df-tier\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003cth class=\"on\"\u003ePerformance Optimized\u003c\/th\u003e\n\u003cth\u003eMicro Series\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal. Accepts any subwoofer that clears the published cutout and mounting depth.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eWoofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.\u003c\/td\u003e\n\u003ctd\u003eWoofer specific. Cut for one named subwoofer.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFootprint\u003c\/td\u003e\n\u003ctd\u003eSized to the driver diameter.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA shared 30 by 15 inch platform, with cabinet height as the variable. This build sits on that platform at 6.46 inches tall, the height its 4.96 inch motor needs.\u003c\/td\u003e\n\u003ctd\u003eCompact per driver footprint.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFront baffle\u003c\/td\u003e\n\u003ctd\u003eSingle, 3\/4 inch.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eDouble, 1.5 inch, outer layer machined as a flush recess.\u003c\/td\u003e\n\u003ctd\u003eDouble, 1.5 inch.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eDriver mounting\u003c\/td\u003e\n\u003ctd\u003eSolid flange. You drill your own mounting holes.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eThreaded inserts pressed at the shop on Dayton's published bolt circle; stainless machine screws included.\u003c\/td\u003e\n\u003ctd\u003eThreaded inserts, stainless machine screws included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eJoinery\u003c\/td\u003e\n\u003ctd\u003eV-groove and dado, CNC cut.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eV-groove and dado, CNC cut, full-height divider and perimeter cross brace.\u003c\/td\u003e\n\u003ctd\u003eStack fab, dowel reinforced.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003ePublished alignment\u003c\/td\u003e\n\u003ctd\u003eModeled Qtc profiles across a range of drivers. No single response curve.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.\u003c\/td\u003e\n\u003ctd\u003eTarget alignment described in the listing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eCarpet\u003c\/td\u003e\n\u003ctd\u003eGray standard, black optional.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003ePlush black.\u003c\/td\u003e\n\u003ctd\u003ePlush black.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 year limited.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003e1 year limited.\u003c\/td\u003e\n\u003ctd\u003e2 years.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eFeet ship with every tier, uninstalled on purpose.\u003c\/strong\u003e Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eThis page is a Performance Optimized enclosure.\u003c\/strong\u003e The airspace, the cutout and the cabinet height all come from the driver's own numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Pair of Dayton Audio Reference RSS210HO\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. The baffle is cut to 7.28 in for Dayton's 8.39 in frame. The airspace lands on \u003cstrong\u003e0.39 cubic feet net per chamber\u003c\/strong\u003e, the volume the cabinet reaches at the height the 4.96 inch motor requires.\u003c\/p\u003e\n\u003cp\u003eThe RSS210HO is Dayton's 8 inch Reference HO: an extra-thick black anodized aluminum cone, a triple shorting-ring motor, a fully vented four-layer coil and parameters Dayton optimizes for small enclosures, rated 300 watts RMS with 11 mm of one-way excursion, 4.96 inches of mounting depth on an 8.39 inch frame. It sits 4.96 inches deep, which matters on a down fire, where the motor rises into the cabinet. Every Thiele-Small figure comes from Dayton's own spec sheet, and it holds together: Qes and Qms reproduce the printed Qts, the moving mass matches the published Vas and cone area, and Qes follows from Bl, Re and Mms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eTwo Chambers, Not One Volume\u003c\/h3\u003e\n\u003cp\u003eThis enclosure follows the Proline X standing rule for dual sealed builds: \u003cstrong\u003etwo fully separate chambers\u003c\/strong\u003e split by a bonded full height 3\/4 inch MDF divider, each driver in its own 0.39 cubic feet with its own polyfill.\u003c\/p\u003e\n\u003cp\u003eTwo drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment either would have on its own. A full divider removes that entirely. One shared side mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eEach chamber is built at \u003cstrong\u003e0.39 cubic feet net per driver\u003c\/strong\u003e, out of 0.90 gross after the divider and the drivers. Dayton does not publish driver displacement (its Vd is the cone's swept volume), so an estimated 0.051 cubic feet per driver is taken out of the net figure. The 4.96 inch mounting depth sets this cabinet's minimum height on the 30 by 15 platform, and the airspace comes with it.\u003c\/p\u003e\n\u003cdiv class=\"df-highlight\"\u003e\u003cp\u003e\u003cstrong\u003eTrue net, not marketing net.\u003c\/strong\u003e Internal volume is calculated from the machined cavity dimensions and the driver's displacement, not guessed from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003e0.39 cubic feet net per chamber on Dayton's published figures: the RSS210HO-4 (single 4 ohm) reads Qtc 0.657 with resonance at 48.6 Hz and half power at 52.6 Hz, and the RSS210HO-8 (single 8 ohm) reads Qtc 0.641 with resonance at 48.6 Hz and half power at 54.2 Hz. One cabinet serves both coils, built to the volume that keeps both closest to maximally flat. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top.\u003c\/p\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference RSS210HO RSS210HO-4 (single 4 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.657\u003c\/td\u003e\n\u003ctd\u003e48.6 Hz\u003c\/td\u003e\n\u003ctd\u003e52.6 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference RSS210HO RSS210HO-8 (single 8 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.641\u003c\/td\u003e\n\u003ctd\u003e48.6 Hz\u003c\/td\u003e\n\u003ctd\u003e54.2 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eDown Fire Construction\u003c\/h3\u003e\n\u003cp\u003eCut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3\/4 inch MDF. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.\u003c\/p\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e30.00 inches wide by 15.00 inches deep by 6.46 inches tall, measured in the down fire position and excluding standoffs\u003c\/strong\u003e. Plan the space around the installed height rather than the cabinet height: the standoffs hold 1.75 inches under the baffle, so the finished stack sits near \u003cstrong\u003e8.21 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv class=\"df-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDouble Baffle, Flush Recess\u003c\/h4\u003e\n\u003cp\u003eThe front baffle is \u003cstrong\u003e1.5 inches\u003c\/strong\u003e, two bonded 3\/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSide-Mounted Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in \u003cstrong\u003e12 gauge OFC\u003c\/strong\u003e to both driver positions. Side mounted so it stays accessible with the baffle facing the floor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eStandoffs Included\u003c\/h4\u003e\n\u003cp\u003eDayton publishes no front clearance figure for the Reference RSS210HO, so this cabinet uses the Proline X standard \u003cstrong\u003e1.75 inch\u003c\/strong\u003e standoff, shipped with every enclosure and left uninstalled so you can place them to suit your floor. At that height the floor slot is 1.21 times the cone area, enough for the Reference RSS210HO.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eMotor Clearance and Orientation\u003c\/h3\u003e\n\u003cp\u003eThe motors rise off the baffle into the cavity, so on a down fire cabinet the clearance that matters runs to the top panel. The 4.96 inch mounting depth puts the motor 3.46 inches into a 4.21 inch cavity, leaving \u003cstrong\u003e0.75 inches above the motor\u003c\/strong\u003e against a 0.75 inch minimum. Height was set by that clearance, not by the airspace: the volume alone would have allowed a lower box.\u003c\/p\u003e\n\u003cp\u003eDayton does not publish a position on down firing this driver, and this cabinet makes no claim on their behalf. The feet ship uninstalled, so if you would rather run it front firing or up firing, that is a decision you can make at install time without changing anything about the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePower, Mounting and Warranty\u003c\/h3\u003e\n\u003cp\u003eDayton rates the Reference RSS210HO at \u003cstrong\u003e300 watts RMS\u003c\/strong\u003e, 600 watts RMS combined. Dayton sells the RSS210HO as RSS210HO-4 (single 4 ohm) and RSS210HO-8 (single 8 ohm); a matched pair should share a coil. A pair of single 4 ohm drivers lands on 2 ohms in parallel or 8 ohms in series. A pair of single 8 ohm drivers lands on 4 ohms in parallel or 16 ohms in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003eDayton prints the RSS210HO's bolt circle, 7.76 inches, so the threaded inserts are pressed into the baffle at the shop and stainless machine screws are included: the driver drops in and bolts down. The enclosure carries a 1 year limited warranty. Bring your own pair of Reference RSS210HO; the drivers are purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eCut for the Driver, Not the Catalog\u003c\/h3\u003e\n\u003cp\u003eBuilt one at a time in Tullahoma, Tennessee, with standoffs and a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47424617644121,"sku":"PO 8D-S DF RSS210HO","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_RSS210HO_Front.jpg?v=1791681467"},{"product_id":"performance-optimized-wedge-sealed-dual-8-enclosure-dayton-audio-reference-rss210ho","title":"Dayton Audio Reference RSS210HO 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 | Dual Dayton Audio Reference RSS210HO\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\"\u003e0.31 ft3 Net per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.75 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.69 to 0.71\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eTwo Separate Chambers\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e24.39\" x 11\" x 7.21\/11.21\"\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\u003eA Pair of Dayton Audio Reference RSS210HO in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe RSS210HO is Dayton's 8 inch Reference HO: an extra-thick black anodized aluminum cone, a triple shorting-ring motor, a fully vented four-layer coil and parameters Dayton optimizes for small enclosures, rated 300 watts RMS with 11 mm of one-way excursion, 4.96 inches of mounting depth on an 8.39 inch frame. Every Thiele-Small figure comes from Dayton's own spec sheet, and it holds together: Qes and Qms reproduce the printed Qts, the moving mass matches the published Vas and cone area, and Qes follows from Bl, Re and Mms.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.31 cubic feet net per chamber on Dayton's published figures: the RSS210HO-4 (single 4 ohm) reads Qtc 0.708 with resonance at 52.4 Hz and half power at 52.3 Hz, and the RSS210HO-8 (single 8 ohm) reads Qtc 0.690 with resonance at 52.4 Hz and half power at 53.7 Hz. One cabinet serves both coils, built to the volume that keeps both closest to maximally flat. That is spread either side of maximally flat: the lower-Q coil a little drier, the higher-Q coil a little punchier.\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 bonded full-height 3\/4 inch MDF divider splits the cabinet into two sealed chambers of 0.31 cubic feet net each, so every driver sees exactly the airspace printed on this page. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.\u003c\/p\u003e\n\u003cp\u003eThe cabinet is 24.39 inches wide, 11 tall, 7.21 inches deep at the top and 11.21 at the base; the airspace sets the width. One shared side-mounted terminal cup feeds both driver positions.\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 a pair of Dayton Audio Reference RSS210HO\u003c\/h2\u003e\n\u003cp\u003eAnechoic half power lands at 52.3 Hz on the RSS210HO-4 (single 4 ohm) and 53.7 Hz on the RSS210HO-8 (single 8 ohm), before any cabin gain. Dayton does not publish driver displacement (its Vd is the cone's swept volume), so an estimated 0.051 cubic feet per driver is taken out of the net figure.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Chamber)\u003c\/h3\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference RSS210HO RSS210HO-4 (single 4 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.708\u003c\/td\u003e\n\u003ctd\u003e52.4 Hz\u003c\/td\u003e\n\u003ctd\u003e52.3 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference RSS210HO RSS210HO-8 (single 8 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.690\u003c\/td\u003e\n\u003ctd\u003e52.4 Hz\u003c\/td\u003e\n\u003ctd\u003e53.7 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is cut to 7.28 in for Dayton's 8.39 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 7.21 in at the top to 11.21 in at the base, and the 4.96 in motor clears it with 0.75 in to spare. Dayton prints the RSS210HO's bolt circle, 7.76 inches, so the threaded inserts are pressed into the baffle at the shop and stainless machine screws are included: the driver drops in and bolts down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhat the Numbers Rest On\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\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eDayton's Published Parameters\u003c\/h4\u003e\n\u003cp\u003eRSS210HO-4 (single 4 ohm): Fs 29.6 Hz, Qts 0.4, Qes 0.46, Qms 3.33, Vas 18.7 L, Mms 99.3 g, Bl 12 N\/A, Re 3.6 ohm. RSS210HO-8 (single 8 ohm): Fs 29.6 Hz, Qts 0.39, Qes 0.45, Qms 2.78, Vas 18.7 L, Mms 99.3 g, Bl 15.6 N\/A, Re 5.9 ohm. Cone area 214 cm2. Xmax 11 mm (one-way, as Dayton publish it).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring a pair of Dayton Audio Reference RSS210HO to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eDayton sells the RSS210HO as RSS210HO-4 (single 4 ohm) and RSS210HO-8 (single 8 ohm); a matched pair should share a coil. A pair of single 4 ohm drivers lands on 2 ohms in parallel or 8 ohms in series. A pair of single 8 ohm drivers lands on 4 ohms in parallel or 16 ohms in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the final load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003ePower handling is 300 watts RMS per driver, 600 across the pair. Aim for roughly 210 to 300 watts per driver at the impedance you wire.\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 with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded inserts pressed at Dayton's bolt circle, stainless machine screws included. 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\u003eDual Dayton Audio Reference RSS210HO: Cut for One Driver\u003c\/h2\u003e\n\u003cp\u003e0.31 cubic feet net per chamber at Qtc 0.69 to 0.71, F3 52.3 Hz on the RSS210HO-4 (single 4 ohm) and 53.7 Hz on the RSS210HO-8 (single 8 ohm), 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":47424618922073,"sku":"PO 8D-S W RSS210HO BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47424618954841,"sku":"PO 8D-S W RSS210HO 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_RSS210HO_Front.jpg?v=1791681551"},{"product_id":"professional-series-ported-dual-8-enclosure-dayton-audio-ultimax-ii-umii8","title":"Dayton Audio Ultimax II UMII8 Dual Box: Ported 8\" 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class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of Ultimax II UMII8, one shared chamber vented at 37.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.01 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 37.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 36.8 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the Ultimax II UMII8\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.01\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e37.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e36.8\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e21.9\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 37.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two Ultimax II UMII8 in 1.014 cubic feet net, vented at 37.0 Hz through a 21.9 square inch port. F3 lands at 36.8 Hz with 1.53 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 10.50 deep.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 21.9 square inches of area at 37.0 Hz, and the design power for the velocity and excursion checks is 960 W for the pair. Passband ripple holds at 1.53 dB across the tuning, with F3 at 36.8 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDayton Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Dayton Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eMounting\u003c\/h4\u003e\n\u003cp\u003eThreaded inserts pressed into the baffle on the published 7.874 inch bolt circle, stainless machine screws included.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 960 W\u003c\/h4\u003e\n\u003cp\u003eThe 21.9 square inch slot beside the woofer is sized so the\n    channel runs 20.6 metres per second and the mouth 12.2 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 5.00 inches along its wall and turns once along the back wall for another 23.91 inches, which is why a 37.0 Hz tuning fits a 10.50 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eA single Ultimax II UMII8 also builds in the Performance Optimized ported down-fire, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 960 W for the pair.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 2.89 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 49 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 10.50\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the Ultimax II UMII8's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 12.2 m\/s against the 17 m\/s point where a slot begins to chuff, and 20.6 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 29 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 10.4 mm of its 18.0 mm at 960 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47424906428505,"sku":"Pro 8D-P UMII8","price":401.99,"currency_code":"USD","in_stock":true}]},{"product_id":"professional-series-ported-dual-8-enclosure-dayton-audio-reference-rss210hf","title":"Dayton Audio Reference RSS210HF Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero 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strong{color:#fff}.df-grid{display:flex;flex-wrap:wrap;gap:18px;margin-top:8px}.df-card{flex:1 1 280px;background:#1c1917;border:1px solid #292524;border-top:3px solid #5b78ff;border-radius:8px;padding:20px 22px}.df-card h4{color:#99abff;margin:0 0 8px;font-size:1.04em}.df-card p{margin:0;font-size:.95em;color:#a8a29e}.df-card strong{color:#fff}.df-highlight{background:#001264;border-left:4px solid #5b78ff;border-radius:0 8px 8px 0;padding:18px 22px;margin:18px 0}.df-highlight p{margin:0;color:#d6d3d1}.df-highlight strong{color:#fff}.df-enc{background:#1c1917;color:#d6d3d1;padding:42px 36px;border-bottom:1px solid #292524}.df-enc h3{color:#fff;font-size:1.45em;font-weight:700;margin:0 0 14px;border-left:4px solid #5b78ff;padding-left:14px}.df-enc p{margin:0 0 14px;color:#d6d3d1}.df-enc-card{background:#292524;border:1px solid #44403c;border-radius:8px;overflow:hidden;margin:18px 0}.df-enc-head{padding:12px 16px;font-size:.82em;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:#99abff;background:#001264}.df-enc-table{width:100%;border-collapse:collapse}.df-enc-table th{background:#0c0a09;color:#a8a29e;font-size:.78em;text-transform:uppercase;letter-spacing:.5px;padding:10px 14px;text-align:left;border-bottom:1px solid #44403c}.df-enc-table td{padding:12px 14px;border-bottom:1px solid #292524;color:#d6d3d1;font-size:.95em}.df-enc-table tr:last-child td{border-bottom:none}.df-opt td{background:#14532d;color:#fff;font-weight:600}.df-char{display:block;font-size:.78em;color:#a8a29e;font-weight:400;margin-top:2px}.df-opt .df-char{color:#86efac}.df-graph{background:#0c0a09;border:1px solid #44403c;border-radius:8px;padding:14px;margin:18px 0}.df-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#a8a29e;margin:0 0 10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of Reference RSS210HF, one shared chamber vented at 36.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e0.86 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 36.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 40.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the Reference RSS210HF\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.86\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e36.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e40.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e15.6\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 36.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two Reference RSS210HF in 0.859 cubic feet net, vented at 36.0 Hz through a 15.6 square inch port. F3 lands at 40.5 Hz with 2.35 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 9.00 deep.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 15.6 square inches of area at 36.0 Hz, and the design power for the velocity and excursion checks is 672 W for the pair. Passband ripple holds at 2.35 dB across the tuning, with F3 at 40.5 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDayton Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Dayton Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eMounting\u003c\/h4\u003e\n\u003cp\u003eThreaded inserts pressed into the baffle on the published 7.756 inch bolt circle, stainless machine screws included.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 672 W\u003c\/h4\u003e\n\u003cp\u003eThe 15.6 square inch slot beside the woofer is sized so the\n    channel runs 17.7 metres per second and the mouth 9.1 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 4.00 inches along its wall and turns once along the back wall for another 21.78 inches, which is why a 36.0 Hz tuning fits a 9.00 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eA single Reference RSS210HF also builds in the Performance Optimized ported wedge, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 672 W for the pair.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eThis cabinet is 2.48 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 46 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 9.00\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the Reference RSS210HF's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 9.1 m\/s against the 17 m\/s point where a slot begins to chuff, and 17.7 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 28 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 8.0 mm of its 9.0 mm at 672 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47424913866841,"sku":"Pro 8D-P RSS210HF","price":399.99,"currency_code":"USD","in_stock":true}]},{"product_id":"professional-series-ported-dual-8-enclosure-dayton-audio-reference-rss210ho","title":"Dayton Audio Reference RSS210HO Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero 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10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#7089ff;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of Reference RSS210HO, one shared chamber vented at 35.5 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e0.82 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 35.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 36.5 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the Reference RSS210HO\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.82\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e35.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e36.5\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e15.6\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 35.5 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two Reference RSS210HO in 0.817 cubic feet net, vented at 35.5 Hz through a 15.6 square inch port. F3 lands at 36.5 Hz with 0.74 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 9.00 deep.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 15.6 square inches of area at 35.5 Hz, and the design power for the velocity and excursion checks is 720 W for the pair. Passband ripple holds at 0.74 dB across the tuning, with F3 at 36.5 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDayton Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Dayton Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eMounting\u003c\/h4\u003e\n\u003cp\u003eThreaded inserts pressed into the baffle on the published 7.756 inch bolt circle, stainless machine screws included.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 720 W\u003c\/h4\u003e\n\u003cp\u003eThe 15.6 square inch slot beside the woofer is sized so the\n    channel runs 21.5 metres per second and the mouth 11.1 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 4.00 inches along its wall and turns once along the back wall for another 24.55 inches, which is why a 35.5 Hz tuning fits a 9.00 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eA single Reference RSS210HO also builds in the Performance Optimized ported wedge and ported down-fire, the smaller and cheaper single-driver boxes. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 720 W for the pair.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 2.48 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 47 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 9.00\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the Reference RSS210HO's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 11.1 m\/s against the 17 m\/s point where a slot begins to chuff, and 21.5 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 28 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 7.0 mm of its 11.0 mm at 720 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47424917274713,"sku":"Pro 8D-P RSS210HO","price":375.99,"currency_code":"USD","in_stock":true}]},{"product_id":"audiocontrol-epicx8-dual-box-sealed-8-wedge-enclosure","title":"AudioControl EPICX8 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 | Dual AudioControl EPICX8\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\"\u003e0.40 ft3 Net per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e0.90 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.78 to 0.79\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eTwo Separate Chambers\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 11\" x 6.54\/10.54\"\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\u003eA Pair of AudioControl EPICX8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe EPICX8 is AudioControl's 8 inch EPICX: a non-pressed paper cone, a composite foam surround, a rigid steel basket, a high-temperature lightweight voice coil and a one-piece dust cap, rated 400 watts RMS with 9.25 mm of one-way excursion, 4.10 inches of mounting depth on an 8.50 inch frame. Every Thiele-Small figure comes from AudioControl's own EPICX8 user manual. Both coil columns agree on Vas and resonance, and both reproduce their printed Qts; the D2 column is measured with the coils in series and the D4 in parallel, which is why their Re and Bl differ while their Re over Bl squared does not.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.40 cubic feet net per chamber on AudioControl's published figures: the EPICX8 D2 (dual 2 ohm) reads Qtc 0.791 with resonance at 59.4 Hz and half power at 53.7 Hz, and the EPICX8 D4 (dual 4 ohm) reads Qtc 0.782 with resonance at 60.0 Hz and half power at 54.8 Hz. One cabinet serves both coils. That is AudioControl's own recommended sealed size for this driver, 0.4 cubic feet, between their 0.25 minimum and 0.65 maximum. That is a touch above maximally flat: a small lift near resonance and firm midbass.\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 bonded full-height 3\/4 inch MDF divider splits the cabinet into two sealed chambers of 0.40 cubic feet net each, so every driver sees exactly the airspace printed on this page. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.\u003c\/p\u003e\n\u003cp\u003eThe cabinet is pinned at the 32 inch dual width cap, 11 inches tall, 6.54 inches deep at the top and 10.54 at the base, with the depth absorbing the airspace. One shared side-mounted terminal cup feeds both driver positions.\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 a pair of AudioControl EPICX8\u003c\/h2\u003e\n\u003cp\u003eAnechoic half power lands at 53.7 Hz on the EPICX8 D2 (dual 2 ohm) and 54.8 Hz on the EPICX8 D4 (dual 4 ohm), before any cabin gain. AudioControl does not publish driver displacement for the EPICX, so an estimated 0.038 cubic feet per driver is taken out of the net figure.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Chamber)\u003c\/h3\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPICX8 EPICX8 D2 (dual 2 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.791\u003c\/td\u003e\n\u003ctd\u003e59.4 Hz\u003c\/td\u003e\n\u003ctd\u003e53.7 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPICX8 EPICX8 D4 (dual 4 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.782\u003c\/td\u003e\n\u003ctd\u003e60.0 Hz\u003c\/td\u003e\n\u003ctd\u003e54.8 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is cut to 6.900 in for AudioControl's 8.500 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 6.54 in at the top to 10.54 in at the base, and the 4.10 in motor clears it with 0.94 in to spare. AudioControl prints no bolt circle for the EPICX8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in its recess, mark its holes, drill and press the inserts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhat the Numbers Rest On\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\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eAudioControl's Published Parameters\u003c\/h4\u003e\n\u003cp\u003eEPICX8 D2 (dual 2 ohm): Fs 47 Hz, Qts 0.626, Qes 0.69, Qms 6.75, Vas 6.74 L, Mms 93.66 g, Bl 12.79 N\/A, Re 3.8 ohm. EPICX8 D4 (dual 4 ohm): Fs 47.6 Hz, Qts 0.62, Qes 0.691, Qms 6.02, Vas 6.68 L, Mms 86.46 g, Bl 8.15 N\/A, Re 1.6 ohm. Cone area 209 cm2. Xmax 9.25 mm (one-way, method not stated).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring a pair of AudioControl EPICX8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eAudioControl sells the EPICX8 as EPICX8 D2 (dual 2 ohm) and EPICX8 D4 (dual 4 ohm); a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the final load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003ePower handling is 400 watts RMS per driver, 800 across the pair. Aim for roughly 280 to 400 watts per driver at the impedance you wire.\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 with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded insert kit and stainless machine screws included (AudioControl publishes no bolt circle). 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\u003eDual AudioControl EPICX8: Cut for One Driver\u003c\/h2\u003e\n\u003cp\u003e0.40 cubic feet net per chamber at Qtc 0.78 to 0.79, F3 53.7 Hz on the EPICX8 D2 (dual 2 ohm) and 54.8 Hz on the EPICX8 D4 (dual 4 ohm), 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":47457473953881,"sku":"PO 8D-S W EPICX8 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47457474314329,"sku":"PO 8D-S W EPICX8 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_EPICX8_Front.jpg?v=1791931782"},{"product_id":"audiocontrol-epicx8-dual-box-sealed-8-down-fire-enclosure","title":"AudioControl EPICX8 Dual Box: Sealed 8\" Down Fire Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#5c3317 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero p{font-size:1.1em;font-weight:300;opacity:.93;margin:0 0 22px;color:#d6d3d1}.df-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:10px}.df-badge{background:rgba(184,115,51,.18);border:1px solid #b87333;color:#e8b98d;padding:7px 16px;border-radius:18px;font-size:.8em;font-weight:600}.df-stats{display:flex;flex-wrap:wrap;background:#1c1917}.df-stat{flex:1 1 200px;text-align:center;padding:26px 16px;border-right:1px solid #292524;border-bottom:1px solid #292524}.df-stat 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class=\"df-hero\"\u003e\n\u003ch2\u003eProline X Performance Optimized Down Fire Dual 8\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of AudioControl EPICX8\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003e0.80 cu ft Net Total\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eSeparate Chambers\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eStandoffs Included\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stats\"\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.40\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.78-0.79\u003c\/span\u003e\u003cspan class=\"l\"\u003esystem Qtc per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e53.7 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff, anechoic, lowest coil\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e6.44 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height, excludes standoffs\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePerformance, Performance Optimized, and Micro\u003c\/h3\u003e\n\u003cp\u003eProline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.\u003c\/p\u003e\n\u003cdiv class=\"df-tier\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003cth class=\"on\"\u003ePerformance Optimized\u003c\/th\u003e\n\u003cth\u003eMicro Series\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal. Accepts any subwoofer that clears the published cutout and mounting depth.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eWoofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.\u003c\/td\u003e\n\u003ctd\u003eWoofer specific. Cut for one named subwoofer.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFootprint\u003c\/td\u003e\n\u003ctd\u003eSized to the driver diameter.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA shared 30 by 15 inch platform, with cabinet height as the variable. This build sits on that platform at 6.44 inches tall, the height that gives each driver its own 0.40 cubic feet.\u003c\/td\u003e\n\u003ctd\u003eCompact per driver footprint.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFront baffle\u003c\/td\u003e\n\u003ctd\u003eSingle, 3\/4 inch.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eDouble, 1.5 inch, outer layer machined as a flush recess.\u003c\/td\u003e\n\u003ctd\u003eDouble, 1.5 inch.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eDriver mounting\u003c\/td\u003e\n\u003ctd\u003eSolid flange. You drill your own mounting holes.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eThreaded insert kit and stainless machine screws included. AudioControl publishes no bolt circle, so the inserts go in at install.\u003c\/td\u003e\n\u003ctd\u003eThreaded inserts, stainless machine screws included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eJoinery\u003c\/td\u003e\n\u003ctd\u003eV-groove and dado, CNC cut.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eV-groove and dado, CNC cut, full-height divider and perimeter cross brace.\u003c\/td\u003e\n\u003ctd\u003eStack fab, dowel reinforced.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003ePublished alignment\u003c\/td\u003e\n\u003ctd\u003eModeled Qtc profiles across a range of drivers. No single response curve.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.\u003c\/td\u003e\n\u003ctd\u003eTarget alignment described in the listing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eCarpet\u003c\/td\u003e\n\u003ctd\u003eGray standard, black optional.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003ePlush black.\u003c\/td\u003e\n\u003ctd\u003ePlush black.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 year limited.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003e1 year limited.\u003c\/td\u003e\n\u003ctd\u003e2 years.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eFeet ship with every tier, uninstalled on purpose.\u003c\/strong\u003e Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eThis page is a Performance Optimized enclosure.\u003c\/strong\u003e The airspace, the cutout and the cabinet height all come from the driver's own numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Pair of AudioControl EPICX8\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. The baffle is cut to 6.900 in for AudioControl's 8.500 in frame. The airspace lands on \u003cstrong\u003e0.40 cubic feet net per chamber\u003c\/strong\u003e, AudioControl's own recommended sealed size for this driver.\u003c\/p\u003e\n\u003cp\u003eThe EPICX8 is AudioControl's 8 inch EPICX: a non-pressed paper cone, a composite foam surround, a rigid steel basket, a high-temperature lightweight voice coil and a one-piece dust cap, rated 400 watts RMS with 9.25 mm of one-way excursion, 4.10 inches of mounting depth on an 8.50 inch frame. It sits 4.10 inches deep, which matters on a down fire, where the motor rises into the cabinet. Every Thiele-Small figure comes from AudioControl's own EPICX8 user manual. Both coil columns agree on Vas and resonance, and both reproduce their printed Qts; the D2 column is measured with the coils in series and the D4 in parallel, which is why their Re and Bl differ while their Re over Bl squared does not.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eTwo Chambers, Not One Volume\u003c\/h3\u003e\n\u003cp\u003eThis enclosure follows the Proline X standing rule for dual sealed builds: \u003cstrong\u003etwo fully separate chambers\u003c\/strong\u003e split by a bonded full height 3\/4 inch MDF divider, each driver in its own 0.40 cubic feet with its own polyfill.\u003c\/p\u003e\n\u003cp\u003eTwo drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment either would have on its own. A full divider removes that entirely. One shared side mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eEach chamber is built at \u003cstrong\u003e0.40 cubic feet net per driver\u003c\/strong\u003e, out of 0.90 gross after the divider and the drivers. AudioControl does not publish driver displacement for the EPICX, so an estimated 0.038 cubic feet per driver is taken out of the net figure. \u003c\/p\u003e\n\u003cdiv class=\"df-highlight\"\u003e\u003cp\u003e\u003cstrong\u003eTrue net, not marketing net.\u003c\/strong\u003e Internal volume is calculated from the machined cavity dimensions and the driver's displacement, not guessed from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003e0.40 cubic feet net per chamber on AudioControl's published figures: the EPICX8 D2 (dual 2 ohm) reads Qtc 0.791 with resonance at 59.4 Hz and half power at 53.7 Hz, and the EPICX8 D4 (dual 4 ohm) reads Qtc 0.782 with resonance at 60.0 Hz and half power at 54.8 Hz. One cabinet serves both coils. That is AudioControl's own recommended sealed size for this driver, 0.4 cubic feet, between their 0.25 minimum and 0.65 maximum. That is a touch above maximally flat: a small lift near resonance and firm midbass.\u003c\/p\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPICX8 EPICX8 D2 (dual 2 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.791\u003c\/td\u003e\n\u003ctd\u003e59.4 Hz\u003c\/td\u003e\n\u003ctd\u003e53.7 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPICX8 EPICX8 D4 (dual 4 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.782\u003c\/td\u003e\n\u003ctd\u003e60.0 Hz\u003c\/td\u003e\n\u003ctd\u003e54.8 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eDown Fire Construction\u003c\/h3\u003e\n\u003cp\u003eCut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3\/4 inch MDF. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.\u003c\/p\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e30.00 inches wide by 15.00 inches deep by 6.44 inches tall, measured in the down fire position and excluding standoffs\u003c\/strong\u003e. Plan the space around the installed height rather than the cabinet height: the standoffs hold 1.75 inches under the baffle, so the finished stack sits near \u003cstrong\u003e8.19 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv class=\"df-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDouble Baffle, Flush Recess\u003c\/h4\u003e\n\u003cp\u003eThe front baffle is \u003cstrong\u003e1.5 inches\u003c\/strong\u003e, two bonded 3\/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSide-Mounted Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in \u003cstrong\u003e12 gauge OFC\u003c\/strong\u003e to both driver positions. Side mounted so it stays accessible with the baffle facing the floor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eStandoffs Included\u003c\/h4\u003e\n\u003cp\u003eAudioControl publishes no front clearance figure for the EPICX8, so this cabinet uses the Proline X standard \u003cstrong\u003e1.75 inch\u003c\/strong\u003e standoff, shipped with every enclosure and left uninstalled so you can place them to suit your floor. At that height the floor slot is 1.17 times the cone area, enough for the EPICX8.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eMotor Clearance and Orientation\u003c\/h3\u003e\n\u003cp\u003eThe motors rise off the baffle into the cavity, so on a down fire cabinet the clearance that matters runs to the top panel. The 4.10 inch mounting depth puts the motor 2.60 inches into a 4.19 inch cavity, leaving \u003cstrong\u003e1.59 inches above the motor\u003c\/strong\u003e against a 0.75 inch minimum. Height was set by the airspace, above the minimum the clearance alone would have required.\u003c\/p\u003e\n\u003cp\u003eAudioControl does not publish a position on down firing this driver, and this cabinet makes no claim on their behalf. The feet ship uninstalled, so if you would rather run it front firing or up firing, that is a decision you can make at install time without changing anything about the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePower, Mounting and Warranty\u003c\/h3\u003e\n\u003cp\u003eAudioControl rates the EPICX8 at \u003cstrong\u003e400 watts RMS\u003c\/strong\u003e, 800 watts RMS combined. AudioControl sells the EPICX8 as EPICX8 D2 (dual 2 ohm) and EPICX8 D4 (dual 4 ohm); a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003eAudioControl prints no bolt circle for the EPICX8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in its recess, mark its holes, drill and press the inserts. The enclosure carries a 1 year limited warranty. Bring your own pair of EPICX8; the drivers are purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eCut for the Driver, Not the Catalog\u003c\/h3\u003e\n\u003cp\u003eBuilt one at a time in Tullahoma, Tennessee, with standoffs and a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47457477132377,"sku":"PO 8D-S DF EPICX8","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_EPICX8_Front.jpg?v=1791931819"},{"product_id":"audiocontrol-spike-spk-8-dual-box-sealed-8-wedge-enclosure","title":"AudioControl Spike SPK-8 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 | Dual AudioControl Spike SPK-8\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\"\u003e0.50 ft3 Net per Chamber\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e1.13 ft3 Gross\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eQtc 0.85\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003eTwo Separate Chambers\u003c\/span\u003e\u003cspan class=\"po-badge\"\u003e32.00\" x 11\" x 7.96\/11.96\"\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\u003eA Pair of AudioControl Spike SPK-8 in a Sealed Wedge\u003c\/h2\u003e\n\u003cp\u003eThe SPK-8 is AudioControl's 8 inch Spike: a mica-coated fiber matrix paper cone, a three-layer high-temperature coil former, a dual damping system and a heavy-duty motor, with a removable grille, rated 350 watts RMS with 8.5 mm of one-way excursion, 4.29 inches of mounting depth on an 8.43 inch frame. Every Thiele-Small figure comes from AudioControl's own Spike Series user guide, one full parameter block per coil, and each block holds together on Qts, moving mass, cone area and sensitivity. AudioControl measures the 2 ohm and 4 ohm versions as separate drivers, and they differ, so each is aligned on its own figures below.\u003c\/p\u003e\n\u003cdiv class=\"po-highlight\"\u003e\u003cp\u003e0.50 cubic feet net per chamber on AudioControl's published figures: the SPK-8S4 (single 4 ohm) reads Qtc 0.852 with resonance at 68.2 Hz and half power at 58.6 Hz. That is AudioControl's own recommended sealed size for this driver, 0.5 cubic feet, between their 0.25 minimum and 0.75 maximum. That is well above maximally flat: a clear lift near resonance and extra midbass, the way AudioControl voices it in this size. This cabinet is listed for the SPK-8S4 (single 4 ohm) only. AudioControl's SPK-8S2 (single 2 ohm) version reads Qtc 0.56 in the same airspace, too damped to sound right sealed, so it is not offered in this enclosure.\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 bonded full-height 3\/4 inch MDF divider splits the cabinet into two sealed chambers of 0.50 cubic feet net each, so every driver sees exactly the airspace printed on this page. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.\u003c\/p\u003e\n\u003cp\u003eThe cabinet is pinned at the 32 inch dual width cap, 11 inches tall, 7.96 inches deep at the top and 11.96 at the base, with the depth absorbing the airspace. One shared side-mounted terminal cup feeds both driver positions.\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 a pair of AudioControl Spike SPK-8\u003c\/h2\u003e\n\u003cp\u003eAnechoic half power lands at 58.6 Hz, before any cabin gain. AudioControl publishes the driver displacement, 0.05 cubic feet, and it is taken out of the net figure for each driver.\u003c\/p\u003e\n\u003ch3\u003eAlignment Numbers (Per Chamber)\u003c\/h3\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpike SPK-8 SPK-8S4 (single 4 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.852\u003c\/td\u003e\n\u003ctd\u003e68.2 Hz\u003c\/td\u003e\n\u003ctd\u003e58.6 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMounting Geometry\u003c\/h3\u003e\n\u003cp\u003eThe baffle is cut to 7.250 in for AudioControl's 8.425 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 7.96 in at the top to 11.96 in at the base, and the 4.29 in motor clears it with 2.17 in to spare. AudioControl prints no bolt circle for the SPK-8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in its recess, mark its holes, drill and press the inserts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWhat the Numbers Rest On\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\" Front Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo bonded 3\/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-card\"\u003e\n\u003ch4\u003eAudioControl's Published Parameters\u003c\/h4\u003e\n\u003cp\u003eSPK-8S4 (single 4 ohm): Fs 60.3665 Hz, Qts 0.7535, Qes 0.8733, Qms 5.4933, Vas 3.9378 L, Mms 92.3784 g, Bl 11.331 N\/A, Re 3.2 ohm. Cone area 194 cm2. Xmax 8.5 mm (one-way, method not stated).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"po-section\"\u003e\n\u003ch2\u003eWiring a pair of AudioControl Spike SPK-8 to Your Amplifier\u003c\/h2\u003e\n\u003cp\u003eThis cabinet is for the Spike SPK-8 SPK-8S4 (single 4 ohm); a matched pair should share a coil. A pair of single 4 ohm drivers lands on 2 ohms in parallel or 8 ohms in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the final load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003ePower handling is 350 watts RMS per driver, 700 across the pair. Aim for roughly 244 to 350 watts per driver at the impedance you wire.\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 with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded insert kit and stainless machine screws included (AudioControl publishes no bolt circle). 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\u003eDual AudioControl Spike SPK-8: Cut for One Driver\u003c\/h2\u003e\n\u003cp\u003e0.50 cubic feet net per chamber at Qtc 0.85, F3 58.6 Hz, 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":47457482702937,"sku":"PO 8D-S W SPK8 BB","price":319.99,"currency_code":"USD","in_stock":true},{"title":"None","offer_id":47457482735705,"sku":"PO 8D-S W SPK8 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_SPK8_Front.jpg?v=1791932118"},{"product_id":"audiocontrol-spike-spk-8-dual-box-sealed-8-down-fire-enclosure","title":"AudioControl Spike SPK-8 Dual Box: Sealed 8\" Down Fire Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica 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10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#3d2412;color:#e8b98d}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(184,115,51,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\u003cdiv class=\"df-hero\"\u003e\n\u003ch2\u003eProline X Performance Optimized Down Fire Dual 8\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of AudioControl Spike SPK-8\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003e1.00 cu ft Net Total\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eSeparate Chambers\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eStandoffs Included\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stats\"\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.50\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.852\u003c\/span\u003e\u003cspan class=\"l\"\u003esystem Qtc per chamber\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e58.6 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff, anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e7.51 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height, excludes standoffs\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePerformance, Performance Optimized, and Micro\u003c\/h3\u003e\n\u003cp\u003eProline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.\u003c\/p\u003e\n\u003cdiv class=\"df-tier\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003cth class=\"on\"\u003ePerformance Optimized\u003c\/th\u003e\n\u003cth\u003eMicro Series\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal. Accepts any subwoofer that clears the published cutout and mounting depth.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eWoofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.\u003c\/td\u003e\n\u003ctd\u003eWoofer specific. Cut for one named subwoofer.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFootprint\u003c\/td\u003e\n\u003ctd\u003eSized to the driver diameter.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA shared 30 by 15 inch platform, with cabinet height as the variable. This build sits on that platform at 7.51 inches tall, the height that gives each driver its own 0.50 cubic feet.\u003c\/td\u003e\n\u003ctd\u003eCompact per driver footprint.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eFront baffle\u003c\/td\u003e\n\u003ctd\u003eSingle, 3\/4 inch.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eDouble, 1.5 inch, outer layer machined as a flush recess.\u003c\/td\u003e\n\u003ctd\u003eDouble, 1.5 inch.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eDriver mounting\u003c\/td\u003e\n\u003ctd\u003eSolid flange. You drill your own mounting holes.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eThreaded insert kit and stainless machine screws included. AudioControl publishes no bolt circle, so the inserts go in at install.\u003c\/td\u003e\n\u003ctd\u003eThreaded inserts, stainless machine screws included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eJoinery\u003c\/td\u003e\n\u003ctd\u003eV-groove and dado, CNC cut.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eV-groove and dado, CNC cut, full-height divider and perimeter cross brace.\u003c\/td\u003e\n\u003ctd\u003eStack fab, dowel reinforced.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003ePublished alignment\u003c\/td\u003e\n\u003ctd\u003eModeled Qtc profiles across a range of drivers. No single response curve.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eA real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.\u003c\/td\u003e\n\u003ctd\u003eTarget alignment described in the listing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eCarpet\u003c\/td\u003e\n\u003ctd\u003eGray standard, black optional.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003ePlush black.\u003c\/td\u003e\n\u003ctd\u003ePlush black.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"a\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 year limited.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003e1 year limited.\u003c\/td\u003e\n\u003ctd\u003e2 years.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eFeet ship with every tier, uninstalled on purpose.\u003c\/strong\u003e Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"df-note\"\u003e\u003cp\u003e\u003cstrong\u003eThis page is a Performance Optimized enclosure.\u003c\/strong\u003e The airspace, the cutout and the cabinet height all come from the driver's own numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Pair of AudioControl Spike SPK-8\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. The baffle is cut to 7.250 in for AudioControl's 8.425 in frame. The airspace lands on \u003cstrong\u003e0.50 cubic feet net per chamber\u003c\/strong\u003e, AudioControl's own recommended sealed size for this driver.\u003c\/p\u003e\n\u003cp\u003eThe SPK-8 is AudioControl's 8 inch Spike: a mica-coated fiber matrix paper cone, a three-layer high-temperature coil former, a dual damping system and a heavy-duty motor, with a removable grille, rated 350 watts RMS with 8.5 mm of one-way excursion, 4.29 inches of mounting depth on an 8.43 inch frame. It sits 4.29 inches deep, which matters on a down fire, where the motor rises into the cabinet. Every Thiele-Small figure comes from AudioControl's own Spike Series user guide, one full parameter block per coil, and each block holds together on Qts, moving mass, cone area and sensitivity. AudioControl measures the 2 ohm and 4 ohm versions as separate drivers, and they differ, so each is aligned on its own figures below.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eTwo Chambers, Not One Volume\u003c\/h3\u003e\n\u003cp\u003eThis enclosure follows the Proline X standing rule for dual sealed builds: \u003cstrong\u003etwo fully separate chambers\u003c\/strong\u003e split by a bonded full height 3\/4 inch MDF divider, each driver in its own 0.50 cubic feet with its own polyfill.\u003c\/p\u003e\n\u003cp\u003eTwo drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment either would have on its own. A full divider removes that entirely. One shared side mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eEach chamber is built at \u003cstrong\u003e0.50 cubic feet net per driver\u003c\/strong\u003e, out of 1.13 gross after the divider and the drivers. AudioControl publishes the driver displacement, 0.05 cubic feet, and it is taken out of the net figure for each driver. \u003c\/p\u003e\n\u003cdiv class=\"df-highlight\"\u003e\u003cp\u003e\u003cstrong\u003eTrue net, not marketing net.\u003c\/strong\u003e Internal volume is calculated from the machined cavity dimensions and the driver's displacement, not guessed from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003e0.50 cubic feet net per chamber on AudioControl's published figures: the SPK-8S4 (single 4 ohm) reads Qtc 0.852 with resonance at 68.2 Hz and half power at 58.6 Hz. That is AudioControl's own recommended sealed size for this driver, 0.5 cubic feet, between their 0.25 minimum and 0.75 maximum. That is well above maximally flat: a clear lift near resonance and extra midbass, the way AudioControl voices it in this size. This cabinet is listed for the SPK-8S4 (single 4 ohm) only. AudioControl's SPK-8S2 (single 2 ohm) version reads Qtc 0.56 in the same airspace, too damped to sound right sealed, so it is not offered in this enclosure.\u003c\/p\u003e\n\u003ctable class=\"df-tier\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver (per chamber)\u003c\/th\u003e\n\u003cth\u003eSystem Qtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpike SPK-8 SPK-8S4 (single 4 ohm)\u003c\/td\u003e\n\u003ctd\u003eQtc 0.852\u003c\/td\u003e\n\u003ctd\u003e68.2 Hz\u003c\/td\u003e\n\u003ctd\u003e58.6 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eDown Fire Construction\u003c\/h3\u003e\n\u003cp\u003eCut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3\/4 inch MDF. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.\u003c\/p\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e30.00 inches wide by 15.00 inches deep by 7.51 inches tall, measured in the down fire position and excluding standoffs\u003c\/strong\u003e. Plan the space around the installed height rather than the cabinet height: the standoffs hold 1.75 inches under the baffle, so the finished stack sits near \u003cstrong\u003e9.26 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv class=\"df-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eDouble Baffle, Flush Recess\u003c\/h4\u003e\n\u003cp\u003eThe front baffle is \u003cstrong\u003e1.5 inches\u003c\/strong\u003e, two bonded 3\/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3\/4 inch of internal clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSide-Mounted Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in \u003cstrong\u003e12 gauge OFC\u003c\/strong\u003e to both driver positions. Side mounted so it stays accessible with the baffle facing the floor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eStandoffs Included\u003c\/h4\u003e\n\u003cp\u003eAudioControl publishes no front clearance figure for the Spike SPK-8, so this cabinet uses the Proline X standard \u003cstrong\u003e1.75 inch\u003c\/strong\u003e standoff, shipped with every enclosure and left uninstalled so you can place them to suit your floor. At that height the floor slot is 1.33 times the cone area, enough for the Spike SPK-8.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eMotor Clearance and Orientation\u003c\/h3\u003e\n\u003cp\u003eThe motors rise off the baffle into the cavity, so on a down fire cabinet the clearance that matters runs to the top panel. The 4.29 inch mounting depth puts the motor 2.79 inches into a 5.26 inch cavity, leaving \u003cstrong\u003e2.47 inches above the motor\u003c\/strong\u003e against a 0.75 inch minimum. Height was set by the airspace, above the minimum the clearance alone would have required.\u003c\/p\u003e\n\u003cp\u003eAudioControl does not publish a position on down firing this driver, and this cabinet makes no claim on their behalf. The feet ship uninstalled, so if you would rather run it front firing or up firing, that is a decision you can make at install time without changing anything about the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePower, Mounting and Warranty\u003c\/h3\u003e\n\u003cp\u003eAudioControl rates the Spike SPK-8 at \u003cstrong\u003e350 watts RMS\u003c\/strong\u003e, 700 watts RMS combined. This cabinet is for the Spike SPK-8 SPK-8S4 (single 4 ohm); a matched pair should share a coil. A pair of single 4 ohm drivers lands on 2 ohms in parallel or 8 ohms in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003eAudioControl prints no bolt circle for the SPK-8, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in its recess, mark its holes, drill and press the inserts. The enclosure carries a 1 year limited warranty. Bring your own pair of Spike SPK-8; the drivers are purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eCut for the Driver, Not the Catalog\u003c\/h3\u003e\n\u003cp\u003eBuilt one at a time in Tullahoma, Tennessee, with standoffs and a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47457483358297,"sku":"PO 8D-S DF SPK8","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_8D-S_DF_SPK8_Front.jpg?v=1791932151"},{"product_id":"professional-series-ported-dual-8-enclosure-audiocontrol-spike-spk-8","title":"AudioControl Spike SPK-8 Dual Box: Ported 8\" Professional Series Enclosure","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero 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14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#001264;color:#99abff}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(91,120,255,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}}\u003c\/style\u003e\n\u003cdiv class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 8\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported eight inch box for a pair of Spike SPK-8, one shared chamber vented at 40.0 Hz\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e1.25 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 40.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 34.4 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the Spike SPK-8\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.25\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e40.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e34.4\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e25.0\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 40.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThis cabinet holds two Spike SPK-8 in 1.252 cubic feet net, vented at 40.0 Hz through a 25.0 square inch port. F3 lands at 34.4 Hz with 1.82 dB of passband ripple. It measures 34.00 inches wide, 14.00 tall and 11.00 deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e AudioControl does not publish the mounting hole locations for the Spike SPK-8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n  \u003cp\u003eBoth drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 25.0 square inches of area at 40.0 Hz, and the design power for the velocity and excursion checks is 840 W for the pair. Passband ripple holds at 1.82 dB across the tuning, with F3 at 34.4 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eAudioControl logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the AudioControl mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 840 W\u003c\/h4\u003e\n\u003cp\u003eThe 25.0 square inch slot beside the woofer is sized so the\n    channel runs 23.9 metres per second and the mouth 14.8 metres per second at 1.2 times the driver's rating, under the\n    17 metres per second where a slot starts to chuff. The channel runs 5.25 inches along its wall and turns once along the back wall for another 15.19 inches, which is why a 40.0 Hz tuning fits an 11.00 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eA single Spike SPK-8 also builds in the Performance Optimized ported down-fire, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 840 W for the pair.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 3.03 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 48 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e34.00\" W x 14.00\" H x 11.00\" D external. A windowed brace runs front to back beside the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our dual 8 inch Professional envelope, built around the Spike SPK-8's own frame and mounting depth, with both woofers on one face and the port on the left. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003ePort mouth velocity peaks at 14.8 m\/s against the 17 m\/s point where a slot begins to chuff, and 23.9 m\/s in the channel, both measured at the pair's design power. Both drivers must be the same model and the same coil: mixing them puts unequal loads on one shared chamber, and neither driver sees the airspace it was picked for. AudioControl does not publish the mounting hole locations for the Spike SPK-8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 32 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 7.6 mm of its 8.5 mm at 840 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47457504231513,"sku":"Pro 8D-P SPK8","price":409.99,"currency_code":"USD","in_stock":true}]}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/collections\/proline-x-enclosure-x-series-fits-kicker-solo-x-8-subwoofersubwoofer-enclosuresproline-x-9950209_477251af-c16d-467e-8aa8-aa6e37a1e148.jpg?v=1790597992","url":"https:\/\/audiointensity.com\/collections\/dual-8-inch-subwoofer-box.oembed?page=2","provider":"Audio Intensity","version":"1.0","type":"link"}