Ground Zero GZRW 38XSPL-D2 (2x2 Ohm)

15″ subwoofer · dual 2 Ω

Fs 33.5 HzQts 0.62Vas 2.31 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 volume2.83 ft³ (80 L)
Qtc0.84
Fc45 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)30 Hz
Portslot 1 15/16 × 16 5/16″, 15 3/16″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 1/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.5 Hz
Qts0.62
Qes0.691
Qms6
Vas2.31 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax0.79″
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m87.5 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power—

Mounting dimensions

Ø≈ 15 1/16″cutout Ø13 7/8″mounting depth 7 1/4″magnet Ø≈ 9 1/16″
Cutout diameter13 7/8″
Mounting depth7 1/4″

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