Ground Zero GZNW 12SPL-XFLEX (2x1 Ohm)

12″ subwoofer · dual 1 Ω · 2,500 W RMS

Fs 33.9 HzQts 0.36Vas 0.96 ft³Xmax 2.36″

Recommended box

For a sedan, one sub, 2,500 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 volume0.90 ft³ (25.5 L)
Qtc0.52
Fc49 Hz
F3 (−3 dB, no cabin gain)75 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 11 1/2″
Open sealed box in designer

Ported

Net volume1.48 ft³ (42 L)
Tuning (Fb)31 Hz
Portround port Ø2 1/2″, 7 1/2″ long
Port velocity at 2,500 W656 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)20 7/8″ × 15 3/4″ × 11 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.9 Hz
Qts0.36
Qes0.39
Qms4.4
Vas0.96 ft³
Re (one coil)≈ 0.85 Ω
Sd78.1 in²
Xmax2.36″
Vd184.4 in³ calc.
Mms290 g calc.
BL11.6 T·m calc.
EBP87 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.4 dB calc.

General

Size12″
Voice coilsdual 1 Ω
RMS power2,500 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/4″mounting depth 8 7/8″magnet Ø8 11/16″
Cutout diameter11 1/4″
Mounting depth8 7/8″
Overall diameter12 5/8″
Magnet diameter8 11/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 78.1 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