Ground Zero GZRW 8XSPL (2x2 Ohm)

8″ subwoofer · dual 2 Ω · 500 W RMS

Fs 45.8 HzQts 0.36Vas 0.26 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 500 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume0.32 ft³ (9 L)
Qtc0.49
Fc62 Hz
F3 (−3 dB, no cabin gain)102 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.64 ft³ (18 L)
Tuning (Fb)39 Hz
Portround port Ø2 1/2″, 11 15/16″ long
Port velocity at 500 W232 ft/s
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)15 1/16″ × 15 3/4″ × 7 11/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45.8 Hz
Qts0.36
Qes0.383
Qms6
Vas0.26 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 33.3 in²
Xmax0.87″
EBP120 — suits ported calc.
Sensitivity, 1 W / 1 m84.7 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø≈ 8 3/8″cutout Ø7 3/16″mounting depth 5 1/4″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth5 1/4″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Ground Zero 8″ models