{"product_id":"performance-optimized-down-fire-sealed-dual-10-enclosure-jl-audio-10tw1","title":"JL Audio 10TW1 Dual Box: Sealed 10\" 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 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class=\"df-wrap\"\u003e\n\u003cdiv class=\"df-hero\"\u003e\n\u003ch2\u003eProline X Performance Optimized Down Fire Dual 10\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of JL Audio 10TW1 thin-line subwoofers\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\"\u003e0.69 cu ft Net\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eSeparate Chambers\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\"\u003e0.69\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net total\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e0.932\u003c\/span\u003e\u003cspan class=\"l\"\u003esystem Qtc per driver, -2 coil\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e48.4 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff, -2 coil\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e6 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height\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\n\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. 24.5 by 13.5 inches on the 10 inch.\u003c\/td\u003e\n\u003ctd class=\"on\"\u003eShared 30 by 15 inch platform on most builds, with cabinet height as the variable. A few drivers need a wider or deeper platform.\u003c\/td\u003e\n\u003ctd\u003eCompact per driver footprint. 21.5 by 14.5 inches on the 10 inch.\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\"\u003e8\/32 threaded inserts, stainless machine screws included.\u003c\/td\u003e\n\u003ctd\u003e8\/32 threaded 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, 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\n\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 cutouts and the cabinet height all come from the JL Audio 10TW1's own published numbers. A Performance box fits your subwoofers. A Performance Optimized box was built for them.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around the 10TW1\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. Both baffle positions are bored to the 10TW1's \u003cstrong\u003e9.055 inch cutout\u003c\/strong\u003e, 230mm, and the cabinet height is set by the driver's \u003cstrong\u003e4.37 inch mounting depth\u003c\/strong\u003e, 111mm. The 10TW1 is JL's thin-line ten, so a pair of them fits in a cabinet just 6 inches tall.\u003c\/p\u003e\n\u003cp\u003eEach 10TW1 is a single voice coil subwoofer, offered as the 2 ohm 10TW1-2 and the 4 ohm 10TW1-4, rated \u003cstrong\u003e300 watts RMS\u003c\/strong\u003e. Across the pair that is \u003cstrong\u003e600 watts RMS combined\u003c\/strong\u003e and twice the cone area, roughly 6 dB more maximum output than one driver in the same alignment.\u003c\/p\u003e\n\u003cp\u003ePublished Thiele-Small parameters for the 10TW1-2 are \u003cstrong\u003eFs 41.5 Hz, Qts 0.65, and Vas of 10.31 liters\u003c\/strong\u003e, 0.364 cubic feet, per driver, with 0.047 cubic feet of displacement each. The 4 ohm 10TW1-4 is listed at \u003cstrong\u003eFs 38.1 Hz, Qts 0.60, Vas 12.2 liters\u003c\/strong\u003e. One set does not cover both coils, so both alignments are published below.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e0.78 cubic feet gross\u003c\/strong\u003e and \u003cstrong\u003e0.69 cubic feet net total\u003c\/strong\u003e, which is \u003cstrong\u003e0.34 cubic feet net per driver\u003c\/strong\u003e. Net is what each driver actually sees, after panel thickness, the chamber divider, bracing and the driver's own 0.047 cubic feet of displacement are subtracted.\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 published displacement, not estimated from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003eAt 0.34 net per chamber, each driver sits right on the 0.35 cubic feet JL Audio recommends for the 10TW1. A 10TW1-2 lands at \u003cstrong\u003eQtc 0.932\u003c\/strong\u003e with \u003cstrong\u003eFc 59.5 Hz\u003c\/strong\u003e and a predicted \u003cstrong\u003eF3 of 48.4 Hz\u003c\/strong\u003e; a pair of 10TW1-4 lands at \u003cstrong\u003eQtc 0.900, Fc 57.2 Hz, F3 47.4 Hz\u003c\/strong\u003e. That is above the 0.707 maximally flat reference, so there is more lift near the corner than the single cabinet shows at Qtc 0.791. Be straight about the tradeoff: the single is the better aligned product and this one is the output product. Firing down into the floor, the sealed rolloff meets rising cabin gain below 60 Hz either way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eTwo Chambers, Not One\u003c\/h3\u003e\n\u003cp\u003eThis enclosure follows the Proline X standing design rule for dual sealed builds: two fully separate chambers split by a bonded full-height 3\/4 inch MDF divider, so each driver gets its own dedicated airspace and its own polyfill. Two drivers sharing one sealed volume interact acoustically, with each driver's compression phase becoming the pressure environment the other works against, which smears transient response and blurs the alignment each would have on its own. A full divider removes the interaction completely.\u003c\/p\u003e\n\u003cp\u003eThe divider runs vertically, so splitting the cabinet does not change the depth requirement at all. Minimum internal height after the flush recess baffle layer and the milled magnet relief is 3.75 inches, a 6 inch external cabinet, with the half inch minimum clearance maintained behind each motor. Every external dimension is stated as measured in the down fire position.\u003c\/p\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, a dense 48.5 lb\/ft³ board with a 200 psi internal bond and 410,000 psi MOE. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps both chambers airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.\u003c\/p\u003e\n\u003cp\u003ePerimeter cross-bracing carries the panels and polyfill is pre-installed in each chamber. Both drivers land on 8\/32 threaded inserts, and two sets of stainless steel machine screws are included.\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 at both driver positions, two bonded 3\/4 inch sheets, with the outer layer machined as a flush recess so each driver bolts to the inner layer. That recovers 3\/4 inch of internal clearance against a 4.37 inch mounting depth, and a \u003cstrong\u003e3\/8 inch relief\u003c\/strong\u003e is milled behind each motor for the rest.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSide-Mounted Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eOne shared Proline 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 in parallel. Side mounted so it stays accessible with the baffles facing the floor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSeparate Chambers\u003c\/h4\u003e\n\u003cp\u003eA \u003cstrong\u003efull-height bonded 3\/4 inch MDF divider\u003c\/strong\u003e gives each 10TW1 its own 0.34 cubic feet net and its own polyfill, so neither driver is working against the other's compression stroke.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ENCLOSURE PERFORMANCE SLOT --\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003ePower and Warranty\u003c\/h3\u003e\n\u003cp\u003eJL Audio rates each 10TW1 at \u003cstrong\u003e300 watts RMS continuous\u003c\/strong\u003e, \u003cstrong\u003e600 watts RMS combined\u003c\/strong\u003e across the pair. Set gain carefully; a thin-line motor has less excursion in reserve than a W-series driver.\u003c\/p\u003e\n\u003cp\u003eBoth drivers are single voice coils, so there is no coil configuration decision at the driver. Wired in parallel through the one shared cup, a pair of 10TW1-4 presents a \u003cstrong\u003e2 ohm load\u003c\/strong\u003e and a pair of 10TW1-2 presents \u003cstrong\u003e1 ohm\u003c\/strong\u003e. Many amplifiers are not stable at 1 ohm, so confirm yours before powering the system.\u003c\/p\u003e\n\u003cp\u003eThe enclosure carries a 1 year limited warranty. Bring your own pair of JL Audio 10TW1 subwoofers; 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\u003eTwo cutouts, two chambers, two milled magnet reliefs, every dimension set by the JL Audio 10TW1 and nothing else. Machined on ShopSabre CNC routers and built one at a time in Tullahoma, Tennessee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47855849799769,"sku":"PO 10D-S DF TW1","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_10D-S_DF_TW1_Front.jpg?v=1794614042","url":"https:\/\/audiointensity.com\/products\/performance-optimized-down-fire-sealed-dual-10-enclosure-jl-audio-10tw1","provider":"Audio Intensity","version":"1.0","type":"link"}