Ground Zero GZNW 15X-D2 (2x2 Ohm)

15″ subwoofer · dual 2 Ω · 2,500 W RMS

Fs 35.2 HzQts 0.54Vas 0.99 ft³Xmax 2.44″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 2,500 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 volume1.41 ft³ (40 L)
Qtc0.70
Fc46 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 12 1/4″
Open sealed box in designer

Ported

Net volume2.54 ft³ (72 L)
Tuning (Fb)29 Hz
Portslot 2 3/4 × 16 11/16″, 51 7/8″ long
Port velocity at 2,500 W92 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 16 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.2 Hz
Qts0.54
Qes0.593
Qms6
Vas0.99 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax2.44″
EBP59 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.1 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power2,500 W

Mounting dimensions

Ø≈ 15 3/8″cutout Ø14 3/16″mounting depth 9 13/16″magnet Ø7 13/16″
Cutout diameter14 3/16″
Mounting depth9 13/16″
Magnet diameter7 13/16″

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