Ground Zero GZPW 15XQ (4x1 Ohm)

15″ subwoofer · 1 Ω · 5,000 W RMS

Fs 32 HzQts 0.27Vas 1.73 ft³Xmax 0.98″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 5,000 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 volume1.47 ft³ (41.5 L)
Qtc0.40
Fc47 Hz
F3 (−3 dB, no cabin gain)102 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 12 5/8″
Open sealed box in designer

Ported

Net volume2.37 ft³ (67 L)
Tuning (Fb)29 Hz
Portslot 2 3/8 × 16 11/16″, 47 13/16″ long
Port velocity at 5,000 W151 ft/s
F3 (−3 dB, no cabin gain)84 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 14 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.27
Qes0.283
Qms6
Vas1.73 ft³
Re≈ 0.85 Ω
Sd≈ 124 in²
Xmax0.98″
EBP113 — suits ported calc.
Sensitivity, 1 W / 1 m89.5 dB calc.

General

Size15″
Voice coils1 Ω
RMS power5,000 W

Mounting dimensions

Ø≈ 15 3/8″cutout Ø14 3/16″mounting depth 10 3/16″magnet Ø≈ 9 3/16″
Cutout diameter14 3/16″
Mounting depth10 3/16″

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 15″ models