Ground Zero GZPW 15SPL-EXTREME (2x1 Ohm)

15″ subwoofer · dual 1 Ω

Fs 46 HzQts 0.31Vas 1.01 ft³Xmax 0.69″

Recommended box

For a sedan, one sub, 300 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 volume1.54 ft³ (43.5 L)
Qtc0.40
Fc59 Hz
F3 (−3 dB, no cabin gain)127 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 13 1/8″
Open sealed box in designer

Ported

Net volume2.37 ft³ (67 L)
Tuning (Fb)34 Hz
Port2 round ports Ø2 1/2″, 7 7/8″ long
Port velocity at 300 W163 ft/s
F3 (−3 dB, no cabin gain)108 Hz
Example box (outside)24 3/16″ × 18 1/8″ × 13 3/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs46 Hz
Qts0.31
Qes0.327
Qms6
Vas1.01 ft³
Re (one coil)≈ 0.85 Ω
Sd≈ 124 in²
Xmax0.69″
EBP141 — suits ported calc.
Sensitivity, 1 W / 1 m91.3 dB calc.

General

Size15″
Voice coilsdual 1 Ω
RMS power—

Mounting dimensions

Ø≈ 15 3/8″cutout Ø14 3/16″mounting depth 10 11/16″magnet Ø≈ 9 3/16″
Cutout diameter14 3/16″
Mounting depth10 11/16″

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