Ground Zero GZRW 30XSPL-D1 (2x1 Ohm)

12″ subwoofer · dual 1 Ω

Fs 39.2 HzQts 0.55Vas 0.71 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 volume0.74 ft³ (21 L)
Qtc0.78
Fc55 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 7/16″
Open sealed box in designer

Ported

Net volume1.98 ft³ (56 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 14 5/16″, 27 13/16″ long
Port velocity at 300 W59 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.2 Hz
Qts0.55
Qes0.616
Qms5.54
Vas0.71 ft³
Re (one coil)0.96 Ω
Sd81 in²
Xmax0.79″
Vd63.8 in³ calc.
Mms316 g calc.
BL11 T·m calc.
EBP64 — sealed or ported calc.
Sensitivity, 1 W / 1 m85 dB calc.

General

Size12″
Voice coilsdual 1 Ω
RMS power—

Mounting dimensions

Ø12 11/16″cutout Ø11 1/8″mounting depth 6 1/4″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth6 1/4″
Overall diameter12 11/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 81 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