Ground Zero GZIW 200X (4 Ohm)

8″ subwoofer · 4 Ω · 150 W RMS

Fs 38.4 HzQts 0.48Vas 0.95 ft³Xmax 0.24″

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 volume0.53 ft³ (15 L)
Qtc0.80
Fc64 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 14″
Open sealed box in designer

Ported

Net volume1.31 ft³ (37 L)
Tuning (Fb)38 Hz
Portslot 1 9/16 × 14 5/16″, 28 1/16″ long
Port velocity at 150 W35 ft/s
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38.4 Hz
Qts0.48
Qes0.522
Qms6
Vas0.95 ft³
Re≈ 3.4 Ω
Sd≈ 33.3 in²
Xmax0.24″
EBP74 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.7 dB calc.

General

Size8″
Voice coils4 Ω
RMS power150 W

Mounting dimensions

Ø≈ 8 3/8″cutout Ø7 3/16″mounting depth 4″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth4″

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 8″ models