Ground Zero GZHW 12XSPL-D1 (2x1 Ohm)

12″ subwoofer · dual 1 Ω

Fs 39.7 HzQts 0.48Vas 0.62 ft³Xmax 0.79″

Recommended box

For a sedan, one sub, 300 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)
Qtc0.65
Fc54 Hz
F3 (−3 dB, no cabin gain)62 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)32 Hz
Port2 round ports Ø2 1/2″, 16 1/8″ long
Port velocity at 300 W115 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)26 11/16″ × 15 3/4″ × 9 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.7 Hz
Qts0.48
Qes0.516
Qms6
Vas0.62 ft³
Re (one coil)≈ 0.85 Ω
Sd≈ 76 in²
Xmax0.79″
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size12″
Voice coilsdual 1 Ω
RMS power—

Mounting dimensions

Ø≈ 12 1/4″cutout Ø11 1/16″mounting depth 6 15/16″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth6 15/16″

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