Performance Optimized Down Fire Sealed Dual 10" Enclosure | Morel Ultimo PowerSlim PS104D Dual 10" Sealed enclosure

Because two drivers in a shared sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other driver is working against, which smears transient response and blurs the alignment each would have on its own. A full-height bonded 3/4 inch MDF divider eliminates that completely. Each PS104D gets its own 0.50 cubic feet net, matching Morel's own recommendation, plus its own polyfill. Separate chambers are the standing design rule on every Proline X dual sealed enclosure.

Acoustically identical per driver, roughly 6 dB more maximum output. Both give each PS104D exactly 0.50 cubic feet net and land at Qtc 1.164 with F3 at 35.9 Hz. The difference is physical: both share the 30 by 15 inch footprint, but the single stands 4.9375 inches tall and the dual stands 7.6875.

Combined power handling doubles to 1400 watts RMS, the highest of any dual enclosure in the Down Fire line, and cone area doubles to 692.8 square centimeters. The single fits under seats; the dual is a cargo floor or rear-wall build.

The enclosure uses one side-mounted Proline X terminal cup with a single pair of posts, pre-wired in 12 gauge OFC to both driver positions in parallel. You do not wire the two chambers separately at the amplifier.

Final impedance is set at the drivers. Each PS104D has dual 4 ohm voice coils, so you choose how to wire the two coils on each driver and that determines the load the amplifier sees through the cup. Wire both drivers identically, since mismatched wiring between chambers will split power unevenly. Confirm the resulting load against your amplifier's minimum stable impedance before powering the system.

The voice coil. Morel uses a 129.5mm coil, which is 5.1 inches in diameter, where most shallow 10 inch subwoofers run a 2 to 2.5 inch coil. More than double the diameter means dramatically more surface area for heat dissipation, which is the limiting factor on continuous power handling.

Each coil is wound in four layers of carbon on an aluminium former and paired with a double magnet EVC motor system. Across the pair that gives 1400 watts RMS with 3600 watts of combined transient headroom.

Side mounted, and there is one cup serving both chambers rather than one per chamber. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup regardless of alignment, whether standard, wedge, or down fire. On this cabinet that keeps the connection fully accessible with the enclosure in its installed position, since both baffles face the floor. The cup is our Proline X ABS and carbon fiber composite unit, recessed, with stainless hardware, copper ring terminals, and pre-wired 12 gauge OFC.

Down Fire cabinets are built with square corners as a series standard. The 3 inch top down corner radius used on other Proline X alignments does not apply here. A down fire box is a low, wide platform that sits flat against a floor or cargo deck, and square corners maximize usable internal volume for a given footprint while keeping the cabinet stable on its mounting surface.

V-groove and dado joinery, CNC-cut on ShopSabre routers from Langboard Elite MDF. Every panel joint is a machined interlocking groove that mechanically locks the panels before adhesive is applied, which is what keeps both chambers airtight under sustained pressure cycling. The chamber divider is a full-height bonded 3/4 inch panel. Front baffles are double-layer at 1.5 inches, two bonded 3/4 inch sheets, at both driver positions, which matters with 700 watt drivers bolted to them. Perimeter cross-bracing and pre-installed polyfill in each chamber complete the build. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own pair of Morel Ultimo PowerSlim PS104D subwoofers. The cutouts and mounting depth are direct fit at both driver positions.