Bomber Outdoor 300W 4 Ohm (SW12OUT300-4)

12″ subwoofer · 4 Ω · 300 W RMS

Fs 37 HzQts 0.97Vas 2.98 ft³Xmax 0.24″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 300 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)
Qtc1.58
Fc60 Hz
F3 (−3 dB, no cabin gain)43 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)47 Hz
Portslot 1 3/4 × 14 5/16″, 5 5/8″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 7/8″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37 Hz
Qts0.97
Qes1.14
Qms6.64
Vas2.98 ft³
Re3.58 Ω
Sd81.1 in²
Xmax0.24″
Vd19.5 in³ calc.
Mms85 g calc.
BL7.9 T·m calc.
EBP32 — suits sealed calc.
Sensitivity, 1 W / 1 m87.7 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø11 15/16″cutout ≈ Ø10 13/16″mounting depth 5 1/2″magnet Ø4 3/4″
Cutout diameter≈ 10 13/16″
Mounting depth5 1/2″
Overall diameter11 15/16″
Magnet diameter4 3/4″

“≈” 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