Ground Zero GZHW 12SPL-D2 FLAT (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 700 W RMS

Fs 21 HzQts 0.30Vas 4.15 ft³Xmax 0.63″

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 volume0.78 ft³ (22 L)
Qtc0.75
Fc53 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume1.94 ft³ (55 L)
Tuning (Fb)29 Hz
Portslot 1 15/16 × 14 5/16″, 41 3/4″ long
Port velocity at 700 W60 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs21 Hz
Qts0.30
Qes0.31
Qms9.02
Vas4.15 ft³
Re (one coil)2.1 Ω
Sd84.9 in²
Xmax0.63″
Vd53.5 in³ calc.
Mms208 g calc.
BL13.6 T·m calc.
EBP68 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.5 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power700 W

Mounting dimensions

Ø12 3/8″cutout Ø11 3/16″mounting depth 4 5/8″magnet Ø≈ 7 1/4″
Cutout diameter11 3/16″
Mounting depth4 5/8″
Overall diameter12 3/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 84.9 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