Bomber Carbon 500W 4+4 Ohm (SW12CB-500-4+4)

12″ subwoofer · dual 4 Ω · 500 W RMS

Fs 34 HzQts 0.99Vas 2.12 ft³Xmax 0.37″

Recommended box

For a sedan, one sub, 500 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 volume1.84 ft³ (52 L)
Qtc1.46
Fc50 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.14 ft³ (89 L)
Tuning (Fb)39 Hz
Portslot 2 3/16 × 14 5/16″, 12 3/4″ long
Port velocity at 500 W61 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34 Hz
Qts0.99
Qes1.13
Qms8.29
Vas2.12 ft³
Re (one coil)2.96 Ω
Sd81.1 in²
Xmax0.37″
Vd30.3 in³ calc.
Mms141 g calc.
BL8.9 T·m calc.
EBP30 — suits sealed calc.
Sensitivity, 1 W / 1 m85.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø13 1/16″cutout ≈ Ø11 3/4″mounting depth 5 1/16″magnet Ø5 1/4″
Cutout diameter≈ 11 3/4″
Mounting depth5 1/16″
Overall diameter13 1/16″
Magnet diameter5 1/4″

“≈” 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 Bomber 12″ models