Ground Zero GZIW 250 (4 Ohm)

10″ subwoofer · 4 Ω · 250 W RMS

Fs 27 HzQts 0.44Vas 1.74 ft³Xmax 0.98″

Recommended box

For a sedan, one sub, 250 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 volume0.74 ft³ (21 L)
Qtc0.81
Fc49 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 13 3/8″
Open sealed box in designer

Ported

Net volume2.05 ft³ (58 L)
Tuning (Fb)29 Hz
Portslot 1 9/16 × 14 5/16″, 31 1/8″ long
Port velocity at 250 W49 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 1/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.44
Qes0.475
Qms6
Vas1.74 ft³
Re≈ 3.4 Ω
Sd≈ 52.7 in²
Xmax0.98″
EBP57 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.1 dB calc.

General

Size10″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 10 5/16″cutout ≈ Ø9 1/8″mounting depth 5 1/16″magnet Ø≈ 5 15/16″
Cutout diameter≈ 9 1/8″
Mounting depth5 1/16″

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