Professional Series Ported 8" Enclosure | Ground Zero GZRW 8XSPL

A 0.3600 Qts on 5.00 litres of Vas is a tight, low-compliance motor, and 32.5 Hz brings F3 to 28.2 Hz on 3.82 dB of ripple. At the driver's rated 500 W the port runs 11.8 metres per second through the mouth at 600 W, the reference point the velocity check is measured against. The 214.0 square centimetre Sd behind this solve is not a Ground Zero figure: Ground Zero publishes no cone area for the GZRW 8XSPL, so the number is estimated. Ground Zero also labels its 14.0 mm Xmax figure Max. Excursion without stating a basis; for this model the manual gives a peak-to-peak number, halved here to the one-way figure used in the math, which is the reason this model builds at all while other Ground Zero models with no stated basis are held. 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.

Every driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The GZRW 8XSPL did not clear the channel 28.5 m/s over 0.55 x core 33.8 gate there: the nearest wedge that fits is 30.0 by 9.12 by 13.40 inches with a 13.0 square inch port, and no tuning, width or depth inside that envelope passes. The slot on this box reaches 21.9 square inches. An under-ported box does not fail quietly. Air speed at the mouth rises with power; past the chuff line the flow turns turbulent and the port is audible on every note. The turbulence also chokes the port, so the box behaves as if it were tuned higher than it is, loses output near tuning, and lets the cone travel further below tuning than the design allows. This chassis is a full-size front-firing box on a 2.25 inch baffle built from three 3/4 inch layers with the woofer flush-mounted in the outer layer, a Ground Zero logo acrylic, and a port and excursion budget checked at 600 W. It carries a 2 year warranty against 1.

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: 8 to 12 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; one kit serves one woofer. A dual cabinet ships two kits.

Yes, at 26 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 64 percent of its usable travel at 600 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 26 Hz subsonic filter takes over; around 32.5 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, 1.75 inches wide and 21.9 square inches. It runs 7.00 inches to the back wall and turns once along it for 21.33 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 20.1 metres per second at 600 W, 52 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 11.8 metres per second against the 17 metres per second threshold where a slot starts to chuff.

50 lb, 30.00" W x 14.00" H x 12.50" D external. It ships as a UPS parcel; the price includes shipping in the 48 states. Every Professional cabinet is priced the same way, by its size: this one is 3.04 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 50 lb parcel and checkout adds nothing. The Performance Optimized 8 inch ported wedge is $329.99. The $82 difference is the larger box and the port this driver needs to run at its rating. 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 1.32 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.