Ground Zero GZRW 38SPL (2x2 Ohm)

15″ subwoofer · dual 2 Ω

Fs 33 HzQts 0.39Vas 3.28 ft³Xmax 0.43″

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 volume1.13 ft³ (32 L)
Qtc0.77
Fc65 Hz
F3 (−3 dB, no cabin gain)64 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 10 5/16″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)36 Hz
Portslot 1 9/16 × 16 11/16″, 12 7/16″ long
Port velocity at 300 W64 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 14 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33 Hz
Qts0.39
Qes0.42
Qms5.06
Vas3.28 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax0.43″
EBP79 — sealed or ported calc.
Sensitivity, 1 W / 1 m91 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power—

Mounting dimensions

Ø≈ 15 3/16″cutout Ø14″mounting depth 7 1/2″magnet Ø≈ 9 1/8″
Cutout diameter14″
Mounting depth7 1/2″

“≈” 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