Ground Zero GZRW 250-D2 FLAT (2x2 Ohm)

10″ subwoofer · dual 2 Ω · 400 W RMS

Fs 28 HzQts 0.54Vas 1.26 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 400 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 volume1.06 ft³ (30 L)
Qtc0.80
Fc41 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 5 15/16″
Open sealed box in designer

Ported

Net volume2.12 ft³ (60 L)
Tuning (Fb)27 Hz
Portslot 1 9/16 × 14 5/16″, 35 1/8″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.54
Qes0.6
Qms5.53
Vas1.26 ft³
Re (one coil)1.98 Ω
Sd54.4 in²
Xmax0.87″
Vd47.1 in³ calc.
Mms157 g calc.
BL9.6 T·m calc.
EBP47 — suits sealed calc.
Sensitivity, 1 W / 1 m83.2 dB calc.

General

Size10″
Voice coilsdual 2 Ω
RMS power400 W

Mounting dimensions

Ø10 7/8″cutout Ø9 1/8″mounting depth 3 3/8″magnet Ø≈ 5 15/16″
Cutout diameter9 1/8″
Mounting depth3 3/8″
Overall diameter10 7/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 54.4 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 10″ models