Performance Optimized Down Fire Sealed Dual 12" Enclosure NVX VCW12v3 · Dual 12" Sealed enclosure

The VCW12v3, yes, in either coil (VCW122v3 or VCW124v3). The baffle is cut to 11.18 in, NVX's published cutout, under the 12.64 in frame. The 6.85 inch motor clears the cabinet with 4.22 inch to spare. One cabinet serves both coils: the VCW122v3 (D2) reads Qtc 0.667 with half power at 44.4 Hz, and the VCW124v3 (D4) reads Qtc 0.667 at 44.4 Hz. Run two of the same coil so the chambers match.

Any other 12, no. The airspace is worked out from the VCW12v3's own Qts and Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

0.85 cubic feet is NVX's own optimal sealed volume on the D2 figures (Fs 25.1 Hz, Qts 0.40, Vas 42.9 liters): Qtc 0.667, half power at 44.4 Hz. One cabinet serves both coils: the VCW122v3 (D2) reads Qtc 0.667 with half power at 44.4 Hz, and the VCW124v3 (D4) reads Qtc 0.667 at 44.4 Hz.

That is NVX's own optimal sealed volume for the VCW12v3. It reads Qtc 0.67 on the D2 and 0.67 on the D4, a little under the 0.707 of a maximally flat alignment, so the rolloff is gentle rather than peaked. NVX's manual and product pages are the only published source for this driver, so treat the Qtc as good to a few hundredths.

NVX rates the VCW12v3 at 1200 watts RMS per driver, so target 840 to 1200 watts RMS per driver at the final load.

A pair of VCW122v3 (D2) drivers can land on 0.5 ohm with all four coils in parallel, 2 ohms as series pairs in parallel, or 8 ohms all in series. A pair of VCW124v3 (D4) drivers can land on 1 ohm with all four coils in parallel, 4 ohms as series pairs in parallel, or 16 ohms all in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for; series wiring is the safe default. Confirm your amplifier's minimum stable impedance first.

The cabinet is 11.82 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 13.57 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 blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 0.85 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 44.4 Hz per chamber on the D2, with system resonance at 41.8 Hz. Below Qtc 0.707 the rolloff is gentle and F3 sits above fc, which is what a damped sealed box does.

Those figures exclude cabin gain. In a car the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above.

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 0.85 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, one side-mounted pre-wired terminal cup to both positions, the polyfill lining already in place, the standoffs, and threaded inserts pressed on NVX's published 11.63 inch bolt circle with stainless machine screws.

The pair of NVX VCW12v3 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 12 inch box.