Bomber Carbon 550W 4+4 Ohm (SW12CB-550-4+4)

12″ subwoofer · dual 4 Ω · 550 W RMS

Fs 32 HzQts 0.86Vas 2.26 ft³Xmax 0.37″

Recommended box

For a sedan, one sub, 550 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)
Qtc1.28
Fc48 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)14 15/16″ × 14 15/16″ × 19 11/16″
Open sealed box in designer

Ported

Net volume3.14 ft³ (89 L)
Tuning (Fb)36 Hz
Portslot 2 3/16 × 14 5/16″, 15 3/4″ long
Port velocity at 550 W63 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.86
Qes0.95
Qms8.8
Vas2.26 ft³
Re (one coil)3.1 Ω
Sd81.1 in²
Xmax0.37″
Vd30.3 in³ calc.
Mms150 g calc.
BL9.9 T·m calc.
EBP34 — suits sealed calc.
Sensitivity, 1 W / 1 m85.4 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power550 W

Mounting dimensions

Ø13 1/16″cutout ≈ Ø11 3/4″mounting depth 7 1/16″magnet Ø5 1/4″
Cutout diameter≈ 11 3/4″
Mounting depth7 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