Ground Zero GZRW 300-D2 FLAT (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 450 W RMS

Fs 23.5 HzQts 0.44Vas 2.13 ft³Xmax 1.18″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 450 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 volume0.92 ft³ (26 L)
Qtc0.81
Fc43 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 12 5/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)25 Hz
Portslot 1 15/16 × 14 5/16″, 36 3/4″ long
Port velocity at 450 W60 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23.5 Hz
Qts0.44
Qes0.48
Qms5.61
Vas2.13 ft³
Re (one coil)1.99 Ω
Sd≈ 76 in²
Xmax1.18″
EBP49 — suits sealed calc.
Sensitivity, 1 W / 1 m84.1 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power450 W

Mounting dimensions

Ø12 11/16″cutout Ø10 15/16″mounting depth 3 11/16″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth3 11/16″
Overall diameter12 11/16″

“≈” 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 12″ models