Ground Zero GZIW 12XSPL-D2 (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 32.5 HzQts 0.73Vas 1.43 ft³Xmax 1.34″

Recommended box

For a sedan, one sub, 600 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 volume1.73 ft³ (49 L)
Qtc0.99
Fc44 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 19 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)31 Hz
Portslot 2 3/8 × 14 5/16″, 27 5/16″ long
Port velocity at 600 W60 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.5 Hz
Qts0.73
Qes0.831
Qms6
Vas1.43 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax1.34″
EBP39 — suits sealed calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 1/4″mounting depth 6 3/8″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6 3/8″

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