Ground Zero GZRW 15XSPL (2x2 Ohm)

15″ subwoofer · dual 2 Ω · 1,200 W RMS

Fs 34.1 HzQts 0.59Vas 2.24 ft³Xmax 1.77″

Recommended box

For a sedan, one sub, 1,200 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 volume2.65 ft³ (75 L)
Qtc0.80
Fc46 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 11 1/8″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)30 Hz
Portslot 3 3/4 × 16 11/16″, 32 1/16″ long
Port velocity at 1,200 W62 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 23 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.1 Hz
Qts0.59
Qes0.654
Qms6
Vas2.24 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax1.77″
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.8 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,200 W

Mounting dimensions

Ø≈ 15 3/16″cutout ≈ Ø14″mounting depth 7 5/16″magnet Ø≈ 9 1/16″
Cutout diameter≈ 14″
Mounting depth7 5/16″

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