AudioControl Spike SPK-10 Dual Box: Sealed 10" Wedge Enclosure Dual 10" Sealed enclosure

The Spike SPK-10, yes, in both coil versions. The baffle is cut to 9.250 in for AudioControl's 10.748 in frame. The 5.32 inch motor clears the cabinet with 2.83 inch to spare. Run two of the same coil so the chambers match.

Any other 10, no. The airspace is engineered around the Spike SPK-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.

0.90 cubic feet net per chamber on AudioControl's published figures: the SPK-10S2 (single 2 ohm) reads Qtc 0.694 with resonance at 46.5 Hz and half power at 47.4 Hz, and the SPK-10S4 (single 4 ohm) reads Qtc 0.719 with resonance at 51.3 Hz and half power at 50.4 Hz. One cabinet serves both coils. That is AudioControl's own recommended sealed size for this driver, 0.9 cubic feet, between their 0.75 minimum and 1.15 maximum. That is spread either side of maximally flat: the lower-Q coil a little drier, the higher-Q coil a little punchier.

Cabinet gain in a vehicle lifts the bottom end further, so in the car this reads deeper than the anechoic figures.

AudioControl rates the Spike SPK-10 at 500 watts RMS per driver, so target 350 to 500 watts RMS per driver at the final load.

AudioControl sells the SPK-10 as SPK-10S2 (single 2 ohm) and SPK-10S4 (single 4 ohm); a matched pair should share a coil. A pair of single 2 ohm drivers lands on 1 ohm in parallel or 4 ohms in series. A pair of single 4 ohm drivers lands on 2 ohms in parallel or 8 ohms in series. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so 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 47.4 Hz on the SPK-10S2 (single 2 ohm) and 50.4 Hz on the SPK-10S4 (single 4 ohm) 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 0.90 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 47.4 Hz on the SPK-10S2 (single 2 ohm) and 50.4 Hz on the SPK-10S4 (single 4 ohm) per chamber. The lower-Q coil rolls off gently with F3 above fc; the higher-Q coil carries a small lift near resonance.

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 0.90 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 are not pre-installed: AudioControl publishes no bolt circle for the SPK-10, so set the driver in its recess, mark its holes, drill and press the inserts. The pair of AudioControl Spike SPK-10 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 10 inch box.