Ground Zero GZRW 30C (4 Ohm)

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 27 HzQts 0.35Vas 3.14 ft³Xmax 0.39″

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 volume0.74 ft³ (21 L)
Qtc0.80
Fc62 Hz
F3 (−3 dB, no cabin gain)59 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 9 7/8″
Open sealed box in designer

Ported

Net volume2.33 ft³ (66 L)
Tuning (Fb)32 Hz
Portslot 1 3/4 × 14 5/16″, 24 1/4″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.35
Qes0.39
Qms3.45
Vas3.14 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax0.39″
EBP69 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.5 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø≈ 12 1/2″cutout Ø11 5/16″mounting depth 5 7/8″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth5 7/8″

“≈” 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