Performance Optimized Wedge Sealed Dual 12" Enclosure | One Audio RSq3 Dual 12" Sealed enclosure

Yes. Both coil versions share the same frame, the same 11.125 in cutout and the same 8.50 in mounting depth, so the baffle is cut once and fits either.

They land close acoustically too: Qtc 0.679 on the D1 and 0.649 on the D2 in this cabinet. The choice between them is an impedance decision, not an enclosure one, and on this driver that decision matters more than usual.

That is the published sealed recommendation for the RSq3, and it produces a well damped alignment on both coils: Qtc 0.649 to 0.679 with F3 between 39.6 and 40.8 Hz.

Each chamber is 1.43 cubic feet gross. The RSq3 displaces 0.23 cubic feet, which is two to four times what a typical 12 inch takes out, so the cabinet has to be built noticeably larger than the net figure alone would suggest.

The RSq3 is published at 1500 watts each, so 3000 watts across the pair. Impedance is where this driver needs care: it comes as a dual 1 ohm or a dual 2 ohm.

A single dual 1 ohm gives 2 ohms in series or 0.5 ohms in parallel, and almost nothing is stable into 0.5. A single dual 2 ohm gives 4 ohms or 1 ohm. With two drivers the low combinations get worse: all four coils of a dual 1 ohm pair in parallel is 0.25 ohms, which is effectively a short. Aim for 1 or 2 ohms on the D1 pair, 2 or 4 ohms on the D2 pair. Work out the wiring before you choose the amplifier.

The angled seat-side face matches the roughly 20 degree lean of a factory rear seat, so the cabinet sits flat against it instead of leaving a wasted triangle. The vertical trunk-lid-side face carries the driver, firing rearward into the trunk cavity.

Firing rearward means output loads into the trunk volume and reaches the cabin through the rear seat and deck rather than beaming at the back of your head, which makes it easier to keep the stage forward. The taper also gives height back where the lid closes, so you keep usable cargo space.

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.

That matters more than usual here. The RSq3 is a heavy, long throw driver, so the reaction load into the baffle is high. The 1.5 inches also gives the threaded inserts real material to hold in.

Anechoic F3 lands between 39.6 and 40.8 Hz depending on coil, at Qtc 0.649 to 0.679. That is a properly damped sealed alignment rather than a peaked one.

Those figures are anechoic and 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 number above.

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 would move the alignment off the 1.20 cubic feet this driver is specified for.

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

The two RSq3 drivers are purchased separately. The cabinet is cut direct fit to that driver, so it is not a general purpose 12 inch box.