Ground Zero GZIW 12SPL (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 700 W RMS

Fs 36.9 HzQts 0.67Vas 1.26 ft³Xmax 0.43″

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 volume1.84 ft³ (52 L)
Qtc0.87
Fc48 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.14 ft³ (89 L)
Tuning (Fb)32 Hz
Portslot 2 3/4 × 14 5/16″, 27 5/8″ long
Port velocity at 700 W62 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.9 Hz
Qts0.67
Qes0.75
Qms6.57
Vas1.26 ft³
Re (one coil)2.05 Ω
Sd81.2 in²
Xmax0.43″
Vd35.1 in³ calc.
Mms203 g calc.
BL11.3 T·m calc.
EBP49 — suits sealed calc.
Sensitivity, 1 W / 1 m85.8 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power700 W

Mounting dimensions

Ø12 3/16″cutout Ø11 1/4″mounting depth 6 3/8″magnet Ø5 7/8″
Cutout diameter11 1/4″
Mounting depth6 3/8″
Overall diameter12 3/16″
Magnet diameter5 7/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 81.2 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