Ground Zero GZHW 15SPL (2x2 Ohm)

15″ subwoofer · dual 2 Ω

Fs 40.9 HzQts 0.61Vas 1.76 ft³Xmax 0.79″

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 volume2.44 ft³ (69 L)
Qtc0.80
Fc54 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 19 1/4″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)33 Hz
Portslot 1 15/16 × 16 11/16″, 12 1/16″ long
Port velocity at 300 W65 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 19 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40.9 Hz
Qts0.61
Qes0.679
Qms6
Vas1.76 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax0.79″
EBP60 — sealed or ported calc.
Sensitivity, 1 W / 1 m89 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power—

Mounting dimensions

Ø≈ 15 7/16″cutout Ø14 1/4″mounting depth 8 9/16″magnet Ø≈ 9 1/4″
Cutout diameter14 1/4″
Mounting depth8 9/16″

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