Performance Optimized Wedge Sealed Dual 15" Enclosure NVX VCW15v3 · Dual 15" Sealed enclosure

The VCW154v3 (D4), yes. The baffle is cut to 14.12 in, NVX's published cutout, under the 15.59 in frame. The 8.19 inch motor clears the cabinet with 5.05 inch to spare. This box is for the VCW154v3 (D4). The VCW152v3 D2's higher Qts reads Qtc 0.98 in the same 2.00 cubic feet, boomy rather than tight, so we do not recommend it here.

Any other 15, no. The airspace is worked out from the VCW15v3'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.

2.00 cubic feet is the Butterworth volume on the D4 figures (Fs 31.3 Hz, Qts 0.45, Vas 82.9 liters): Qtc 0.706, half power at 49.2 Hz. This box is for the VCW154v3 (D4). The VCW152v3 D2's higher Qts reads Qtc 0.98 in the same 2.00 cubic feet, boomy rather than tight, so we do not recommend it here.

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 VCW15v3 at 1500 watts RMS per driver, so target 1050 to 1500 watts RMS per driver at the final load.

A pair of VCW154v3 (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. Confirm your amplifier's minimum stable impedance first.

The seat-side face carries a 20 degree rake that matches the lean of a factory rear seat back, so the cabinet sits flush against it and the cargo space in front stays usable. The baffle is the vertical trunk-lid-side face, so the drivers fire rearward into the trunk cavity.

The trunk acts as an acoustic extension for the sealed box, and the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the anechoic 49.2 Hz on this page.

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 2.00 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 49.2 Hz per chamber on the D4, with system resonance at 49.1 Hz. At Qtc 0.71 the response is maximally flat into the rolloff, so F3 and fc coincide.

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 2.00 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 with the gloss black acrylic baffle insert, one side-mounted pre-wired terminal cup to both positions, the polyfill lining already in place, and threaded inserts pressed on NVX's published 14.78 inch bolt circle with stainless machine screws.

The pair of NVX VCW15v3 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 15 inch box.