Ground Zero GZNW 12X-D2 (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 2,000 W RMS

Fs 21.8 HzQts 0.33Vas 1.24 ft³Xmax 2.44″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 2,000 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 volume0.78 ft³ (22 L)
Qtc0.53
Fc35 Hz
F3 (−3 dB, no cabin gain)52 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)25 Hz
Portround port Ø2 1/2″, 12 7/8″ long
Port velocity at 2,000 W530 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)21 7/8″ × 15 3/4″ × 10 13/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs21.8 Hz
Qts0.33
Qes0.349
Qms6
Vas1.24 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax2.44″
EBP62 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power2,000 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 8 1/4″magnet Ø7 13/16″
Cutout diameter11 1/8″
Mounting depth8 1/4″
Magnet diameter7 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