Ground Zero GZIW 200 (4 Ohm)

8″ subwoofer · 4 Ω · 150 W RMS

Fs 32 HzQts 0.44Vas 0.83 ft³Xmax 0.79″

Recommended box

For a sedan, one sub, 150 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 volume0.35 ft³ (10 L)
Qtc0.80
Fc59 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.17 ft³ (33 L)
Tuning (Fb)31 Hz
Portround port Ø2 1/2″, 10 1/16″ long
Port velocity at 150 W137 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 5/16″ × 15 3/4″ × 6 1/2″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.44
Qes0.47
Qms6.53
Vas0.83 ft³
Re3.7 Ω
Sd31.8 in²
Xmax0.79″
Vd25.1 in³ calc.
Mms63 g calc.
BL10 T·m calc.
EBP68 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size8″
Voice coils4 Ω
RMS power150 W

Mounting dimensions

Ø8 5/16″cutout Ø7 3/16″mounting depth 3 15/16″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth3 15/16″
Overall diameter8 5/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 31.8 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 8″ models