Ground Zero GZHW 30X (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 800 W RMS

Fs 23.5 HzQts 0.33Vas 2.19 ft³Xmax 0.48″

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 volume0.67 ft³ (19 L)
Qtc0.69
Fc49 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)29 Hz
Port2 round ports Ø2 1/2″, 20 1/16″ long
Port velocity at 800 W160 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)29 1/8″ × 15 3/4″ × 8 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23.5 Hz
Qts0.33
Qes0.36
Qms4.6
Vas2.19 ft³
Re (one coil)2.15 Ω
Sd75 in²
Xmax0.48″
Vd36.3 in³ calc.
Mms246 g calc.
BL14.7 T·m calc.
EBP65 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.5 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power800 W

Mounting dimensions

Ø≈ 12 1/4″cutout Ø11 1/16″mounting depth 6 3/8″magnet Ø6 11/16″
Cutout diameter11 1/16″
Mounting depth6 3/8″
Magnet diameter6 11/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 75 in².

“≈” 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