Ground Zero GZTW 30TX (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 400 W RMS

Fs 33.7 HzQts 0.53Vas 1.96 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 400 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 volume1.52 ft³ (43 L)
Qtc0.80
Fc51 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 18 11/16″
Open sealed box in designer

Ported

Net volume2.97 ft³ (84 L)
Tuning (Fb)33 Hz
Portslot 1 15/16 × 14 5/16″, 18 15/16″ long
Port velocity at 400 W61 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 5/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.7 Hz
Qts0.53
Qes0.64
Qms3.07
Vas1.96 ft³
Re (one coil)≈ 1.7 Ω
Sd76.9 in²
Xmax0.55″
Vd42.4 in³ calc.
Mms140 g calc.
BL8.9 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power400 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 3/16″mounting depth 5 13/16″magnet Ø≈ 7 1/4″
Cutout diameter11 3/16″
Mounting depth5 13/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 76.9 in².

“≈” 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