Ground Zero GZIW 15SPL (2x2 Ohm)

15″ subwoofer · dual 2 Ω · 900 W RMS

Fs 39.9 HzQts 0.55Vas 2.17 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 900 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 volume1.94 ft³ (55 L)
Qtc0.80
Fc58 Hz
F3 (−3 dB, no cabin gain)55 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 15 7/8″
Open sealed box in designer

Ported

Net volume5.37 ft³ (152 L)
Tuning (Fb)33 Hz
Portslot 3 3/4 × 16 11/16″, 22″ long
Port velocity at 900 W63 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 23 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.9 Hz
Qts0.55
Qes0.61
Qms5.47
Vas2.17 ft³
Re (one coil)2 Ω
Sd138.9 in²
Xmax0.39″
Vd54.7 in³ calc.
Mms295 g calc.
BL15.6 T·m calc.
EBP65 — sealed or ported calc.
Sensitivity, 1 W / 1 m90.1 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power900 W

Mounting dimensions

Ø15 3/16″cutout Ø14 3/16″mounting depth 7 3/8″magnet Ø6 15/16″
Cutout diameter14 3/16″
Mounting depth7 3/8″
Overall diameter15 3/16″
Magnet diameter6 15/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 138.9 in².

“≈” 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