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

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.

The coil is wound in four layers of carbon on an aluminium former and paired with a double magnet EVC motor system. That combination gives 700 watts RMS with 1800 watts of transient headroom in a package 3.1 inches deep, which is the highest power-to-depth ratio of any driver in the Proline X Down Fire program.

The PS104D has a free-air Qts of 0.7, and system Qtc can never fall below the driver's Qts regardless of enclosure size. Even an infinite baffle would leave this driver above 0.7, so no sealed box reaches a textbook 0.707 alignment with it. At Morel's recommended 0.5 cubic feet net the system sits at Qtc 0.986, producing a modest lift near the corner frequency.

That is the intended character of the driver, and Morel designed their enclosure recommendation around it rather than in spite of it.

The PowerSlim is the shallow, higher-power option. It mounts in 3.1 inches with 700 watts RMS, and this cabinet stands 4.9375 inches tall. The SCX102 mounts in 5.26 inches with 500 watts RMS, and its Down Fire cabinet stands 6.875 inches.

The PowerSlim also has the lower free-air resonance at 29.1 Hz against the SCX102's 38.8 Hz, so it reaches deeper. Both use the same 5.1 inch voice coil. Unless you specifically want the SCX voicing, the PowerSlim is the stronger choice in this size, and it fits in two fewer inches of height.

The enclosure has one side-mounted Proline X terminal cup pre-wired in 12 gauge OFC. The PS104D has dual 4 ohm voice coils, so you set the final load at the driver: wire the two coils in parallel for a 2 ohm load, or in series for 8 ohms. Most single-driver builds run the 2 ohm configuration.

Morel rates this driver for a minimum of 350 watts and up to 700 watts RMS. Confirm your amplifier is stable at your chosen load and set gains within that range.

Side mounted. 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 the baffle faces 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 under a seat, 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 the cabinet airtight under sustained pressure cycling. The front baffle is a double layer at 1.5 inches, two bonded 3/4 inch sheets. On a cabinet under 5 inches tall the baffle carries a large share of the structural load, and with a 700 watt driver bolted to it that rigidity matters. Perimeter cross-bracing and pre-installed polyfill complete the build. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own Morel Ultimo PowerSlim PS104D. The cutout and mounting depth are direct fit.