Ground Zero GZHW 30-D2 (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 1,500 W RMS

Fs 39.1 HzQts 0.56Vas 0.62 ft³Xmax 1.77″

Recommended box

For a sedan, one sub, 1,500 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 volume0.72 ft³ (20.5 L)
Qtc0.76
Fc53 Hz
F3 (−3 dB, no cabin gain)52 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/4″
Open sealed box in designer

Ported

Net volume1.77 ft³ (50 L)
Tuning (Fb)31 Hz
Portslot 2 3/16 × 14 5/16″, 44 5/16″ long
Port velocity at 1,500 W91 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.1 Hz
Qts0.56
Qes0.618
Qms6
Vas0.62 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax1.77″
EBP63 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.3 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 3/16″mounting depth 7 13/16″magnet Ø≈ 7 1/4″
Cutout diameter11 3/16″
Mounting depth7 13/16″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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