AudioControl Spike SPK-8 Dual Box: Ported 8" Professional Series Enclosure Dual 8" Ported enclosure

Both drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 25.0 square inches of area at 40.0 Hz, and the design power for the velocity and excursion checks is 840 W for the pair. Passband ripple holds at 1.82 dB across the tuning, with F3 at 34.4 Hz. Tuning is chosen for in-car response rather than an anechoic curve: a vehicle adds roughly 12 dB per octave below about 45 Hz, and this tuning is where that sum comes out flattest across 25 to 60 Hz.

A single Spike SPK-8 also builds in the Performance Optimized ported down-fire, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 840 W for the pair. It carries a 2 year warranty, against 1 year on the Performance Optimized lines.

AudioControl does not publish the mounting hole locations for the Spike SPK-8, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with two kits, one per woofer.

Yes, at 32 Hz, 24 dB per octave. Below tuning a vented box stops loading the cone and excursion runs away toward DC. With the filter in place this cabinet puts the AudioControl Spike SPK-8 at 90 percent of its usable travel at 840 W.

Not one we can show you. We do not build a sealed enclosure for the AudioControl Spike SPK-8 and AudioControl publish no sealed volume for it, so the Performance Graphs tab carries no ported-versus-sealed chart: the only sealed box left to plot would be this cabinet stuffed and sealed, which nobody would build, and a comparison against it would tell you nothing you could buy. What a vented box gives up is the region below tuning, where the cone unloads and the 32 Hz subsonic filter takes over; around 40.0 Hz the vent carries the load and cone travel drops to its minimum, which no sealed alignment can do.

It is a vertical slot beside the woofer, the full height of the cavity, 2.00 inches wide and 25.0 square inches. It runs 5.25 inches to the back wall and turns once along it for 15.19 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 23.9 metres per second at 840 W, 53 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 14.8 metres per second against the 17 metres per second threshold where a slot starts to chuff.

48 lb, 34.00" W x 14.00" H x 11.00" D external. Every Professional cabinet is priced the same way, by its size: this one is 3.03 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 48 lb parcel and checkout adds nothing. Do not add polyfill; it ships dry on purpose.

No. This is an enclosure only, cut for the AudioControl Spike SPK-8 specifically: the 7.250 inch cutout, the 4.291 inch mounting depth allowance and the 1.25 cubic foot alignment all come from AudioControl's published parameters. It fits both AudioControl versions. The pair is tuned on the SPK-8S2 (single 2 ohm), F3 34.4 Hz; a pair of SPK-8S4 (single 4 ohm) was run through the same cabinet and lands at F3 34.4 Hz with 0.6 dB of ripple, each cone 7.8 of its 8.5 mm. Bring your own driver.