Ground Zero GZNW 25C (2x2 Ohm)

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

Fs 42 HzQts 0.50Vas 0.24 ft³Xmax 1.77″

Recommended box

For a sedan, one sub, 1,500 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 volume0.64 ft³ (18 L)
Qtc0.59
Fc49 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)12 5/8″ × 12 5/8″ × 11 1/16″
Open sealed box in designer

Ported

Net volume1.02 ft³ (29 L)
Tuning (Fb)28 Hz
Portround port Ø2 1/2″, 14 3/4″ long
Port velocity at 1,500 W437 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)15 15/16″ × 15 3/4″ × 11″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42 Hz
Qts0.50
Qes0.545
Qms6
Vas0.24 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 52.7 in²
Xmax1.77″
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m81.7 dB calc.

General

Size10″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø≈ 10 9/16″cutout Ø9 3/8″mounting depth 8 1/2″magnet Ø≈ 6 1/16″
Cutout diameter9 3/8″
Mounting depth8 1/2″

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 10″ models