Bomber Bicho Papão 400W 4+4 Ohm (SW12BP-400-4+4)

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 30 HzQts 0.62Vas 3.24 ft³Xmax 0.37″

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 volume1.84 ft³ (52 L)
Qtc1.03
Fc50 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.11 ft³ (88 L)
Tuning (Fb)36 Hz
Portslot 1 3/4 × 14 5/16″, 12 11/16″ long
Port velocity at 400 W65 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 5/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts0.62
Qes0.69
Qms5.81
Vas3.24 ft³
Re (one coil)3.09 Ω
Sd80.4 in²
Xmax0.37″
Vd30.1 in³ calc.
Mms117 g calc.
BL9.9 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m87.6 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø12″cutout ≈ Ø10 13/16″mounting depth 5 13/16″magnet Ø5 1/4″
Cutout diameter≈ 10 13/16″
Mounting depth5 13/16″
Overall diameter12″
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