Ground Zero GZNW 30XMAX-II (2x1 Ohm)

12″ subwoofer · dual 1 Ω · 3,000 W RMS

Fs 35.6 HzQts 0.61Vas 0.48 ft³Xmax 2.36″

Recommended box

For a sedan, one sub, 3,000 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 volume0.92 ft³ (26 L)
Qtc0.75
Fc44 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 12 5/16″
Open sealed box in designer

Ported

Net volume1.73 ft³ (49 L)
Tuning (Fb)26 Hz
Portround port Ø3″, 13 7/8″ long
Port velocity at 3,000 W522 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)22 1/2″ × 15 3/4″ × 12 3/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.6 Hz
Qts0.61
Qes0.679
Qms6
Vas0.48 ft³
Re (one coil)≈ 0.85 Ω
Sd≈ 76 in²
Xmax2.36″
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m81.6 dB calc.

General

Size12″
Voice coilsdual 1 Ω
RMS power3,000 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 9 13/16″magnet Ø7 7/8″
Cutout diameter11 1/8″
Mounting depth9 13/16″
Magnet diameter7 7/8″

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