Performance Optimized Down Fire Sealed Dual 10" Enclosure Skar Audio EVL-10 · Dual 10" Sealed enclosure

The EVL-10, yes, in either coil. The baffle is cut to 9.39 in, Skar's published cutout, under the 10.89 in frame. The 7.16 inch motor clears the cabinet with 1.44 inch to spare. One cabinet serves both coils: the EVL-10 D2 reads Qtc 0.690 with half power at 52.8 Hz, and the D4 reads Qtc 0.721 at 51.3 Hz. Run two of the same coil so the chambers match.

Any other 10, no. The airspace is worked out from the EVL-10'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.

0.65 cubic feet is split between the coils' Butterworth volumes (0.55 for the D2, 0.76 for the D4) on the D2 figures (Fs 44.0 Hz, Qts 0.59, Vas 6.8 liters): Qtc 0.690, half power at 52.8 Hz. One cabinet serves both coils: the EVL-10 D2 reads Qtc 0.690 with half power at 52.8 Hz, and the D4 reads Qtc 0.721 at 51.3 Hz.

Skar's own recommended sealed volume is 1.25 to 1.5 cubic feet, which reads Qtc 0.64 on the D2 and 0.67 on the D4. 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-10 at 1000 watts RMS per driver, so target 700 to 1000 watts RMS per driver at the final load.

A pair of EVL-10 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 EVL-10 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 9.35 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 11.10 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.

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 0.65 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 52.8 Hz per chamber on the D2, with system resonance at 51.5 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 0.65 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 a threaded insert kit with stainless machine screws.

The inserts ship loose on purpose: Skar prints no bolt circle for the EVL-10, so you set the driver in the recess, mark its holes, drill and press the inserts. The pair of Skar EVL-10 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 10 inch box.