Ground Zero GZRW 15D4 (2x4 Ohm)

15″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 24.7 HzQts 0.46Vas 4.80 ft³Xmax 0.49″

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 volume2.37 ft³ (67 L)
Qtc0.80
Fc43 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 10 3/8″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)28 Hz
Portslot 3 1/8 × 16 5/16″, 30 1/2″ long
Port velocity at 1,000 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 22 11/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24.7 Hz
Qts0.46
Qes0.498
Qms6
Vas4.80 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 124 in²
Xmax0.49″
EBP50 — suits sealed calc.
Sensitivity, 1 W / 1 m88.1 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,000 W

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