Ground Zero GZUW 300SQ (2x3 Ohm)

12″ subwoofer · dual 3 Ω · 700 W RMS

Fs 25.3 HzQts 0.42Vas 3.06 ft³Xmax 0.26″

Recommended box

For a sedan, one sub, 700 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
Fc48 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 14 15/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)29 Hz
Portslot 2 3/8 × 14 5/16″, 31 7/8″ long
Port velocity at 700 W64 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25.3 Hz
Qts0.42
Qes0.452
Qms6
Vas3.06 ft³
Re (one coil)≈ 2.55 Ω
Sd≈ 76 in²
Xmax0.26″
EBP56 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.9 dB calc.

General

Size12″
Voice coilsdual 3 Ω
RMS power700 W

Mounting dimensions

Ø≈ 12 1/16″cutout Ø10 7/8″mounting depth 6 7/16″magnet Ø≈ 7 1/16″
Cutout diameter10 7/8″
Mounting depth6 7/16″

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