Ground Zero GZRW 38-D2 (2x2 Ohm)

15″ subwoofer · dual 2 Ω · 1,000 W RMS

Fs 22.9 HzQts 0.50Vas 3.90 ft³Xmax 1.97″

Recommended box

For a sedan, one sub, 1,000 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 volume2.51 ft³ (71 L)
Qtc0.80
Fc37 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 10 5/8″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)25 Hz
Portslot 2 15/16 × 16 11/16″, 38 1/8″ long
Port velocity at 1,000 W62 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 23″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs22.9 Hz
Qts0.50
Qes0.545
Qms6
Vas3.90 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax1.97″
EBP42 — suits sealed calc.
Sensitivity, 1 W / 1 m85.9 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø≈ 15 5/16″cutout Ø14 1/8″mounting depth 7 11/16″magnet Ø≈ 9 3/16″
Cutout diameter14 1/8″
Mounting depth7 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