Performance Optimized Down Fire Sealed 12" Enclosure NVX VCW12v3 · Single 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 0.75 inch to spare. One cabinet serves both coils: the VCW122v3 (D2) reads Qtc 0.609 with half power at 45.2 Hz, and the VCW124v3 (D4) reads Qtc 0.609 at 45.2 Hz.

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.

Because the VCW12v3's 6.85 inch mounting depth sets the minimum cabinet height on the 30 by 15 platform, not the target volume. The motor reaches 5.35 inches into the cavity and needs 0.75 inch above it, which puts the cabinet at 8.35 inches tall and the airspace at 1.15 cubic feet.

The result is Qtc 0.609 with half power at 45.2 Hz on the D2: a gentle rolloff rather than a flat one. One cabinet serves both coils: the VCW122v3 (D2) reads Qtc 0.609 with half power at 45.2 Hz, and the VCW124v3 (D4) reads Qtc 0.609 at 45.2 Hz.

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

The VCW122v3 (D2) wires to 4 ohms with its coils in series or 1 ohm in parallel. The VCW124v3 (D4) wires to 8 ohms in series or 2 ohms in parallel. 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 8.35 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 10.10 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, and here it is the VCW12v3's 6.85 inch motor that sets it.

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. A single 3/4 inch panel flexes under the pressure a 12 inch woofer puts on it at 1200 watts, which smears output and works the driver loose over time; the second layer stiffens the face and gives the mounting hardware twice the material to bite.

The outer layer is machined as a flush recess to the 12.64 inch frame, so the driver bolts to the inner layer.

Anechoic F3 is 45.2 Hz on the D2, with system resonance at 38.1 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 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 1.15 cubic feet 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, 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 NVX VCW12v3 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 12 inch box.