Performance Optimized Down Fire Sealed 12" Enclosure Morel Ultimo Ti SC122 / SC124 · Single 12" Sealed enclosure

Both, yes. The 2 ohm SC122 and the 4 ohm SC124 share one basket, one 10.35 inch cutout, one 12.00 inch frame and one 5.96 inch mounting depth, so the fit is identical and the inserts are pressed for both.

Any other 12, no. The airspace is engineered around the SC122's 0.45 Qts and 68.9 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 SC122, computed from Morel's published Fs 27.51 Hz, Qts 0.45 and Vas 68.86 liters: system Qtc 0.707, maximally flat, with resonance at 43.2 Hz and an anechoic half-power point of 43.2 Hz. Morel's own sealed recommendation for this driver is 20 to 50 liters, 0.71 to 1.76 cubic feet, and 1.66 cubic feet sits inside it.

The 4 ohm SC124 has its own parameter set, Fs 28.00 Hz, Qts 0.41 and Vas 60.29 liters, and in the same cabinet it lands at Qtc 0.620 with F3 at 49.1 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, so target 420 to 600 watts RMS at the final impedance. Both coils are single voice coil drivers: the SC122 is a nominal 2 ohm load at 1.3 ohms DC, the SC124 a nominal 4 ohm load at 3.0 ohms DC.

A 2 ohm load from the SC122 is within most monoblocks' rating, but confirm your amplifier's minimum stable impedance before you buy that coil; the 4 ohm SC124 is the safe answer on any amplifier.

The cabinet is 10.44 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 12.19 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.

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. A subwoofer pushes as hard against its mounting surface as it does against the air, and a single 3/4 inch panel flexes under that load, which smears output and works the driver loose over time.

The outer layer is machined as a flush recess to Morel's 12.00 inch frame, so the driver bolts to the inner layer through pressed threaded inserts.

Anechoic F3 is 43.2 Hz for the SC122 and 49.1 Hz for the SC124, with system resonance at 43.2 and 42.3 Hz. At Qtc 0.71 the response is maximally flat into the rolloff, so F3 and fc coincide for the SC122.

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 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 1.66 cubic feet 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, stainless machine screws, one side-mounted pre-wired terminal cup, the standoffs and the polyfill lining already in place.

The Morel Ultimo Ti SC122 / SC124 is purchased separately. The cabinet is cut direct fit to that driver, so it is not a general purpose 12 inch box.