Ground Zero GZRW 30-D2 (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 800 W RMS

Fs 25.7 HzQts 0.50Vas 1.10 ft³Xmax 1.97″

Recommended box

For a sedan, one sub, 800 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)
Qtc0.80
Fc41 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 9 9/16″
Open sealed box in designer

Ported

Net volume2.26 ft³ (64 L)
Tuning (Fb)25 Hz
Portslot 1 15/16 × 14 5/16″, 49″ long
Port velocity at 800 W73 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25.7 Hz
Qts0.50
Qes0.54
Qms6.75
Vas1.10 ft³
Re (one coil)1.8 Ω
Sd≈ 76 in²
Xmax1.97″
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m81.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power800 W

Mounting dimensions

Ø12 1/4″cutout Ø11 5/16″mounting depth 6 9/16″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth6 9/16″
Overall diameter12 1/4″

Judging by its value, the published Re is for both coils in parallel — converted to per coil.

“≈” 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