Ground Zero GZUW 8CF (2x2 Ohm)

8″ subwoofer · dual 2 Ω · 300 W RMS

Fs 57 HzQts 0.70Vas 0.17 ft³Xmax 0.79″

Recommended box

For a sedan, one sub, 300 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 volume0.35 ft³ (10 L)
Qtc0.85
Fc69 Hz
F3 (−3 dB, no cabin gain)62 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 10 1/16″
Open sealed box in designer

Ported

Net volume0.92 ft³ (26 L)
Tuning (Fb)36 Hz
Port2 round ports Ø2 1/2″, 20 9/16″ long
Port velocity at 300 W105 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)26 7/8″ × 15 3/4″ × 6 11/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs57 Hz
Qts0.70
Qes0.74
Qms11.92
Vas0.17 ft³
Re (one coil)2.05 Ω
Sd31.2 in²
Xmax0.79″
Vd24.5 in³ calc.
Mms93 g calc.
BL9.6 T·m calc.
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.8 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø8 7/16″cutout Ø7 1/8″mounting depth 4 1/4″magnet Ø≈ 4 5/8″
Cutout diameter7 1/8″
Mounting depth4 1/4″
Overall diameter8 7/16″

“≈” 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