Ground Zero GZRW 300X (4 Ohm)

12″ subwoofer · 4 Ω · 500 W RMS

Fs 28.1 HzQts 0.31Vas 2.65 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 volume0.71 ft³ (20 L)
Qtc0.69
Fc61 Hz
F3 (−3 dB, no cabin gain)67 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)36 Hz
Portslot 1 9/16 × 14 5/16″, 28 1/4″ long
Port velocity at 500 W60 ft/s
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.1 Hz
Qts0.31
Qes0.34
Qms4.27
Vas2.65 ft³
Re≈ 3.4 Ω
Sd≈ 76 in²
Xmax0.39″
EBP83 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.9 dB calc.

General

Size12″
Voice coils4 Ω
RMS power500 W

Mounting dimensions

Ø≈ 12 1/4″cutout Ø11 1/16″mounting depth 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
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