Ground Zero GZRW 12XFL (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 28.4 HzQts 0.47Vas 2.24 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 500 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 volume1.17 ft³ (33 L)
Qtc0.80
Fc49 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 6 1/2″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)29 Hz
Portslot 2 3/16 × 14 5/16″, 29 1/16″ long
Port velocity at 500 W60 ft/s
F3 (−3 dB, no cabin gain)27 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

Fs28.4 Hz
Qts0.47
Qes0.51
Qms6
Vas2.24 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax0.35″
EBP56 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.5 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø≈ 12 1/2″cutout Ø11 5/16″mounting depth 2 7/8″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth2 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