Performance Optimized Down Fire Sealed Dual 10" Enclosure Morel Ultimo Ti SC102 / SC104 · Dual 10" Sealed enclosure

Both, yes. The 2 ohm SC102 and the 4 ohm SC104 share one basket, one 8.87 inch cutout, one 10.35 inch frame and one 5.63 inch mounting depth, so the fit is identical and the inserts are pressed for both. Run two of the same model so the chambers match.

Any other 10, no. The airspace is engineered around the SC102's 0.38 Qts and 42.0 liters of Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

It is the Butterworth volume for the SC102, computed from Morel's published Fs 33.00 Hz, Qts 0.38 and Vas 42.00 liters: system Qtc 0.707, maximally flat, with resonance at 61.4 Hz and an anechoic half-power point of 61.4 Hz. Morel's own sealed recommendation for this driver is 13 to 30 liters, 0.46 to 1.06 cubic feet, and 0.60 cubic feet sits inside it.

The 4 ohm SC104 has its own parameter set, Fs 29.00 Hz, Qts 0.35 and Vas 50.00 liters, and in the same cabinet it lands at Qtc 0.694 with F3 at 58.6 Hz, a touch more damped. One cabinet serves both coils because the box is sized to the coil that asks for the larger volume.

Morel rates the Ultimo Titanium SC at 600 watts RMS per driver, so target 420 to 600 watts RMS per driver at the final impedance. Both coils are single voice coil drivers: the SC102 is a nominal 2 ohm load at 1.3 ohms DC, the SC104 a nominal 4 ohm load at 3.0 ohms DC.

Wire both drivers identically so the chambers share power evenly. Two SC102 in parallel is a 1 ohm load and needs an amplifier rated for it; in series they present 4 ohms. Two SC104 run 2 ohms in parallel or 8 ohms in series.

The cabinet is 8.82 inches tall measured in the down fire position, and that figure excludes the standoffs. The standoffs hold 1.75 inches under the baffle, so plan your space around a finished stack of roughly 10.57 inches.

The footprint is the standard Performance Optimized down fire platform, 30.00 inches wide by 15.00 deep. Height is the only dimension solved to the driver.

Two drivers sharing one sealed volume load each other: each driver's compression stroke becomes the pressure the other works against, which smears transients and blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 0.60 cubic feet and its own polyfill.

It also means a failure in one driver does not unload the other, and the alignment on this page is the alignment in each chamber, not an average across a shared box.

Anechoic F3 is 61.4 Hz for the SC102 and 58.6 Hz for the SC104 per chamber, with system resonance at 61.4 and 57.5 Hz. At Qtc 0.71 the response is maximally flat into the rolloff, so F3 and fc coincide for the SC102.

Those figures exclude cabin gain. In a car the transfer function of the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above. Morel's own sheet publishes no in-box F3 for this driver.

No. Polyfill is already installed in both chambers as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 0.60 cubic feet per chamber this cabinet was built to.

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet, threaded inserts pressed to the Morel bolt pattern at both positions, stainless machine screws, one side-mounted pre-wired terminal cup, the standoffs and the polyfill lining already in place.

The pair of Morel Ultimo Ti SC102 / SC104 is purchased separately. The cabinet is cut direct fit to that driver, so it is not a general purpose 10 inch box.