Ground Zero GZRW 30SPL-EXTREME (2x2 Ohm)

12″ subwoofer · dual 2 Ω

Fs 33.7 HzQts 0.43Vas 1.64 ft³Xmax 0.43″

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 volume0.71 ft³ (20 L)
Qtc0.78
Fc61 Hz
F3 (−3 dB, no cabin gain)60 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume2.15 ft³ (61 L)
Tuning (Fb)33 Hz
Portslot 1 9/16 × 14 5/16″, 21 13/16″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.7 Hz
Qts0.43
Qes0.46
Qms5.93
Vas1.64 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax0.43″
EBP73 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power—

Mounting dimensions

Ø≈ 12 1/4″cutout Ø11 1/16″mounting depth 6 3/16″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth6 3/16″

“≈” 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 12″ models