Ground Zero GZRW 8XSPL 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 31.2 square inches of area at 34.0 Hz, and the design power for the velocity and excursion checks is 1200 W for the pair. Passband ripple holds at 3.04 dB across the tuning, with F3 at 29.5 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 GZRW 8XSPL 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 1200 W for the pair. It carries a 2 year warranty, against 1 year on the Performance Optimized lines.

Ground Zero does not publish the mounting hole locations for the GZRW 8XSPL, 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 27 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 Ground Zero GZRW 8XSPL at 61 percent of its usable travel at 1200 W.

Not one we can show you. We do not build a sealed enclosure for the Ground Zero GZRW 8XSPL and Ground Zero 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 27 Hz subsonic filter takes over; around 34.0 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, 2.50 inches wide and 31.2 square inches. It runs 8.00 inches to the back wall and turns once along it for 18.04 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 24.9 metres per second at 1200 W, 53 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 16.5 metres per second against the 17 metres per second threshold where a slot starts to chuff.

54 lb, 34.00" W x 14.00" H x 14.25" D external. Every Professional cabinet is priced the same way, by its size: this one is 3.93 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 54 lb parcel and checkout adds nothing. Do not add polyfill; it ships dry on purpose.

No. This is an enclosure only, cut for the Ground Zero GZRW 8XSPL specifically: the 7.170 inch cutout, the 5.240 inch mounting depth allowance and the 1.76 cubic foot alignment all come from Ground Zero's published parameters. It fits both coil versions; the alignment published here is the SVC or D1. Bring your own driver.