Ground Zero GZHW 38-D2 (2x2 Ohm)

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

Fs 36.3 HzQts 0.52Vas 1.16 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 volume1.31 ft³ (37 L)
Qtc0.71
Fc50 Hz
F3 (−3 dB, no cabin gain)51 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 11 9/16″
Open sealed box in designer

Ported

Net volume2.65 ft³ (75 L)
Tuning (Fb)30 Hz
Portslot 3 1/8 × 16 11/16″, 53″ long
Port velocity at 1,500 W64 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 17 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.3 Hz
Qts0.52
Qes0.569
Qms6
Vas1.16 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax1.77″
EBP64 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.4 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø≈ 15 3/8″cutout Ø14 3/16″mounting depth 9 1/8″magnet Ø≈ 9 3/16″
Cutout diameter14 3/16″
Mounting depth9 1/8″

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