Performance Optimized Wedge Sealed Dual 12" Enclosure Skar Audio EVL-12 · Dual 12" Sealed enclosure

The EVL-12, yes, in either coil. The baffle is cut to 11.22 in, Skar's published cutout, under the 12.50 in frame. The 7.61 inch motor clears the cabinet with 0.75 inch to spare. One cabinet serves both coils: the EVL-12 D4 reads Qtc 0.619 with half power at 51.0 Hz, and the D2 reads Qtc 0.572 at 56.5 Hz. Run two of the same coil so the chambers match.

Any other 12, no. The airspace is worked out from the EVL-12'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.

0.79 cubic feet is the smallest box that carries the EVL-12 frame, already under the Butterworth volume on the D4 figures (Fs 32.6 Hz, Qts 0.46, Vas 18.2 liters): Qtc 0.619, half power at 51.0 Hz. One cabinet serves both coils: the EVL-12 D4 reads Qtc 0.619 with half power at 51.0 Hz, and the D2 reads Qtc 0.572 at 56.5 Hz.

Skar's own recommended sealed volume is 1.75 cubic feet, which reads Qtc 0.54 on the D4 and 0.49 on the D2. Skar's numbers are the only published source for this driver, so treat the Qtc as good to a few hundredths.

Skar rates the EVL-12 at 1250 watts RMS per driver, so target 875 to 1250 watts RMS per driver at the final load.

A pair of EVL-12 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. A pair of EVL-12 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. 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 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 51.0 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 0.79 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 51.0 Hz per chamber on the D4, with system resonance at 43.9 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 0.79 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 a threaded insert kit with stainless machine screws.

The inserts ship loose on purpose: Skar prints no bolt circle for the EVL-12, so you set the driver in the recess, mark its holes, drill and press the inserts. The pair of Skar EVL-12 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 12 inch box.