{"product_id":"performance-optimized-down-fire-sealed-dual-12-enclosure-morel-ultimo-powerslim-ps124d","title":"Performance Optimized Down Fire 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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p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#d99058;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#5c3317 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}@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 PO Down Fire Dual 12\" Sealed\u003c\/h2\u003e\n\u003cp\u003eCut and tuned for a pair of Morel Ultimo PowerSlim PS124D\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\"\u003e1.60 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\"\u003e1.60\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\"\u003e1.070\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\"\u003e10.75 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\u003eBuilt Around a Pair of PS124D\u003c\/h3\u003e\n\u003cp\u003eNothing about this cabinet is generic. Both baffles are bored to the PS124D's \u003cstrong\u003e10.6 inch cutout\u003c\/strong\u003e, 268.6mm to Morel's spec, and the internal height of each chamber is set by the driver's \u003cstrong\u003e3.4 inch mounting depth\u003c\/strong\u003e and the volume it needs. This is the deepest reaching cabinet in the Proline X Down Fire line, and it does it twice.\u003c\/p\u003e\n\u003cp\u003eThe reason is the driver's \u003cstrong\u003e24 Hz free-air resonance against a 49.4 liter Vas\u003c\/strong\u003e. In a 3.4 inch mounting depth those are conventional driver numbers rather than shallow driver numbers, and most shallow 12s sit in the low 30s for free-air resonance, which caps how low they go regardless of the box. Here it produces a \u003cstrong\u003epredicted F3 of 34.2 Hz per driver\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eEach PS124D is a dual 4 ohm voice coil subwoofer rated \u003cstrong\u003e700 watts RMS\u003c\/strong\u003e with 2100 watts maximum transient handling, so the pair carries \u003cstrong\u003e1400 watts RMS combined\u003c\/strong\u003e across 904.8 square centimeters of cone. Flat honeycomb Hexatech aluminium cones, double magnet EVC motors, and 129.5mm voice coils, 5.1 inches, wound in four layers of carbon on aluminium formers. Most shallow 12s run a 2 to 3 inch coil, and that surface area difference is what sets the continuous rating. 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\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 airspace 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 in parallel, 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\u003e0.80 cubic feet net per driver\u003c\/strong\u003e, \u003cstrong\u003e1.60 cubic feet net total\u003c\/strong\u003e, out of 1.78 gross. That per chamber figure is Morel's own sealed recommendation of 22.7 liters, so each driver sees the same alignment it would get on its own: \u003cstrong\u003eQtc 0.966 with a predicted F3 of 34.2 Hz\u003c\/strong\u003e, computed from Morel's published Fs 24 Hz, Qts 0.6 and Vas 49.4 liters. Morel publishes 36 Hz at this volume, agreement inside about 2 Hz.\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\u003eQts is 0.6, so system Qtc cannot fall below 0.6 in any sealed enclosure regardless of volume. The alignment sits just under unity with a modest lift near the corner frequency, which is the driver's intended character.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBe Realistic About the Size\u003c\/h3\u003e\n\u003cp\u003eAt \u003cstrong\u003e10.75 inches tall\u003c\/strong\u003e this is one of the two tallest cabinets in the Down Fire line. It is a cargo floor, rear wall, or behind the bench build, not an under seat one. The footprint stays the standard \u003cstrong\u003e30 by 15 inches\u003c\/strong\u003e, so it occupies no more floor area than any other Down Fire cabinet; it simply stands taller to give each driver its full 0.80 cubic feet. Measure your vertical clearance before ordering.\u003c\/p\u003e\n\u003cp\u003eIf clearance is the constraint, the single 12 inch PowerSlim cabinet at 6.375 inches and the dual 10 inch at 7.6875 inches are the alternatives.\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. 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. Both drivers fire down into the floor, and all external dimensions are measured in the down fire position.\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\u003eBoth front baffles are \u003cstrong\u003e1.5 inches\u003c\/strong\u003e, 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 at both 10.6 inch openings.\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 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. 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 full height \u003cstrong\u003e3\/4 inch bonded MDF divider\u003c\/strong\u003e gives each driver its own sealed 0.80 cubic feet and its own polyfill. Perimeter cross-bracing runs the cabinet, and each driver bolts through its own set of 8\/32 threaded inserts.\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\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\u003eEach driver carries dual 4 ohm coils, so final impedance is set at the drivers, not at the cup. \u003cstrong\u003eWire both drivers identically\u003c\/strong\u003e, since mismatched wiring between chambers splits power unevenly. Confirm the resulting load against your amplifier's minimum stable impedance before powering the system.\u003c\/p\u003e\n\u003cp\u003eThe enclosure carries a 1 year limited warranty. Bring your own pair of Morel Ultimo PowerSlim PS124D; 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\u003eEvery Performance Optimized cabinet is cut to one driver's cutout, mounting depth and displacement, then 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":44540421767257,"sku":"PO 12D-S DF PS","price":299.99,"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_2d9f59a4-ee58-41f4-b510-7cb56cf46d80.jpg?v=1787115088","url":"https:\/\/audiointensity.com\/products\/performance-optimized-down-fire-sealed-dual-12-enclosure-morel-ultimo-powerslim-ps124d","provider":"Audio Intensity","version":"1.0","type":"link"}