{"product_id":"performance-optimized-down-fire-wide-sealed-dual-12-enclosure-morel-ultimo-powerslim-ps124d","title":"Performance Optimized Down Fire Wide Sealed Dual 12\" Enclosure | Morel Ultimo PowerSlim PS124D","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 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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 Wide Dual 12\" Sealed\u003c\/h2\u003e\n\u003cp\u003e41 inch wide, 14 inch deep format. Cut for a pair of Morel Ultimo PowerSlim PS124D\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003eDown Fire Wide\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003eV-Groove and Dado\u003c\/span\u003e\u003cspan class=\"df-badge\"\u003e14\" Deep\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\"\u003e0.807\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net each\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e1.067\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\"\u003e32.7 Hz\u003c\/span\u003e\u003cspan class=\"l\"\u003eF3 rolloff\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e8.75 in\u003c\/span\u003e\u003cspan class=\"l\"\u003ecabinet height, excludes feet\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eThe Down Fire Wide Format\u003c\/h3\u003e\n\u003cp\u003eDown Fire Wide is the Performance Optimized answer to a space that is long rather than deep or tall. This cabinet runs \u003cstrong\u003e41 inches wide by 14 inches deep by 8.75 inches tall\u003c\/strong\u003e: 1 inch shallower front to back than our standard 30 by 15 inch Down Fire platform, and 11 inches longer.\u003c\/p\u003e\n\u003cp\u003eFourteen inches is the practical minimum for a 12 inch driver: a 12 inch frame needs about 13 inches of baffle. Each PS124D's 12.008 inch frame sits on the 14 inch deep baffle with about 1.00 inch of baffle outside the flange fore and aft. Because the airspace is spread along 41 inches instead of 30, the wide cabinet usually stands lower than the standard box, and it does here: \u003cstrong\u003e8.75 inches\u003c\/strong\u003e against \u003cstrong\u003e10.75 inches\u003c\/strong\u003e for the standard 30 by 15 PS124D cabinet.\u003c\/p\u003e\n\u003cp\u003eWith the footprint fixed at 41 by 14, height is the free dimension, and it was solved to the airspace: \u003cstrong\u003e0.807 cubic feet net per chamber\u003c\/strong\u003e, against 0.80 in the standard box. The motor clears the top panel with 4.61 inches to spare, so clearance did not set the height.\u003c\/p\u003e\n\u003cdiv class=\"df-highlight\"\u003e\u003cp\u003e\u003cstrong\u003eWhich one to choose.\u003c\/strong\u003e The standard 30 by 15 is the pick when length is limited. This one is the pick when height or depth is the limit and you have 41 inches of run: under or behind a rear bench, or along a cargo wall. Measure depth and height first; depth is usually the dimension that decides it.\u003c\/p\u003e\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. Down Fire Wide variants like this one run long and shallow for under seat fitment.\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 layer, outer layer machined as a flush recess. 1.5 inch.\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 cutouts, the mounting depth and the chamber volumes all come from the Morel Ultimo PowerSlim PS124D'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 PS124D\u003c\/h3\u003e\n\u003cp\u003eThe baffles are bored to the PS124D's \u003cstrong\u003e10.6 inch cutout\u003c\/strong\u003e, 268.6mm to Morel's spec, and the driver's 3.386 inch mounting depth leaves the motor well clear of the top panel.\u003c\/p\u003e\n\u003cp\u003eThe two numbers that matter most here are resonance and compliance. Fs is 24 Hz against a 49.4 liter Vas, and for a driver that mounts this shallow that pairing is unusual. Most shallow 12s sit in the low 30s for free-air resonance, which caps how low they go regardless of the box.\u003c\/p\u003e\n\u003cp\u003eEach PS124D is a dual 4 ohm subwoofer rated 700 watts RMS with 2100 watts maximum transient handling. Flat honeycomb Hexatech aluminium cone, double magnet EVC motor, and a 129.5mm voice coil, 5.1 inches, wound in four layers of carbon on an aluminium former. Most shallow 12s run a 2 to 3 inch coil; nearly double the diameter gives far more surface area to shed heat. The Ultimo PowerSlim series took the EISA Best In-Car Subwoofer award for 2023-2024.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eNet Volume, Not Gross\u003c\/h3\u003e\n\u003cp\u003eTotal gross volume is 1.81 cubic feet, split by the divider into two chambers. After the brace and an estimated 0.08 cubic feet of displacement (Morel publishes no displacement figure, so the 12 inch rule of thumb is used) per driver, each chamber holds \u003cstrong\u003e0.807 cubic feet net\u003c\/strong\u003e, 1.615 cubic feet net total.\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 estimated from external dimensions minus wall thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003eThat produces \u003cstrong\u003eQtc 1.067 with Fc at 42.7 Hz and a predicted F3 of 32.7 Hz\u003c\/strong\u003e per driver, computed from Morel's published Fs 24 Hz, Qts 0.6 and Vas 49.4 liters.\u003c\/p\u003e\n\u003cp\u003eEach chamber matches Morel's own sealed recommendation of 22.7 liters, so each driver sees the alignment Morel designed for. Qts is 0.6, so system Qtc cannot fall below that in any sealed enclosure; at Qtc 1.067 the alignment carries a modest lift near the corner frequency, which is the driver's intended character.\u003c\/p\u003e\n\u003cp\u003eThese figures are anechoic. Firing down into the floor, the sealed rolloff meets rising cabin gain below about 60 Hz, so in-car response extends below the published F3.\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: \u003cstrong\u003etwo fully separate chambers\u003c\/strong\u003e divided by a bonded full-height 3\/4 inch MDF panel.\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 each would have on its own. A full divider eliminates that. Each PS124D gets its own 0.807 cubic feet net and its own polyfill.\u003c\/p\u003e\n\u003cp\u003eOn a long cabinet the divider does structural work as well, tying the front and rear walls together at the centre of the 41 inch span.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eDown Fire Wide 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\u003eThe cabinet measures \u003cstrong\u003e41 inches wide by 14 inches deep by 8.75 inches tall, measured in the down fire position\u003c\/strong\u003e, excluding the feet. The 1.75 inch standoffs ship with the enclosure but are not installed, so the installed height is \u003cstrong\u003e10.5 inches\u003c\/strong\u003e. Plan the space around that figure.\u003c\/p\u003e\n\u003cdiv class=\"df-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003e1.5 Inch Double Baffle\u003c\/h4\u003e\n\u003cp\u003eTwo \u003cstrong\u003e3\/4 inch layers laminated to 1.5 inches\u003c\/strong\u003e, the outer layer machined as a flush recess so the driver bolts to the inner layer, with 8\/32 threaded inserts at each driver position, stainless machine screws included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eRound Frame, 14 Inch Baffle\u003c\/h4\u003e\n\u003cp\u003eThe 10.6 inch cutouts sit side by side along the 41 inch length on the 14 inch deep baffle, leaving about 1.00 inch of baffle outside the flange fore and aft. No rotation or special layout is needed for a round frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSeparate Chambers\u003c\/h4\u003e\n\u003cp\u003eA bonded \u003cstrong\u003efull-height 3\/4 inch divider\u003c\/strong\u003e gives each driver its own 0.807 cubic feet and its own light polyfill wall lining, and ties the walls together mid span.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eOne Shared Terminal Cup\u003c\/h4\u003e\n\u003cp\u003eProline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, \u003cstrong\u003eside mounted\u003c\/strong\u003e and pre-wired in 12 gauge OFC to both driver positions in parallel.\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 Wiring\u003c\/h3\u003e\n\u003cp\u003eMorel rates each PS124D at \u003cstrong\u003e700 watts RMS\u003c\/strong\u003e with 2100 watts maximum transient handling, and publishes a recommended range of 350 to 700 watts RMS per driver. Combined that is 1400 watts RMS, which asks for a serious amplifier.\u003c\/p\u003e\n\u003cp\u003eOne side mounted terminal cup serves both chambers, pre-wired in 12 gauge OFC to both driver positions in parallel. Each driver carries dual 4 ohm coils, so final impedance is set at the drivers. Wire both identically, since mismatched wiring between chambers splits power unevenly, and confirm the resulting load against your amplifier's minimum stable impedance.\u003c\/p\u003e\n\u003cp\u003eBring your own pair of Morel Ultimo PowerSlim PS124D; the drivers are purchased separately. The enclosure carries a 1 year limited warranty.\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\u003eWe cut every Down Fire Wide cabinet to one driver's published cutout, mounting depth and airspace, then build it one at a time in Tullahoma, Tennessee. 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":47345338777689,"sku":"PO 12D-S DFW PS","price":349.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PO_12D_S_DFW_PS_Front.jpg?v=1790650478","url":"https:\/\/audiointensity.com\/products\/performance-optimized-down-fire-wide-sealed-dual-12-enclosure-morel-ultimo-powerslim-ps124d","provider":"Audio Intensity","version":"1.0","type":"link"}