Bomber Upgrade 500W 4 Ohm (SW12UP-500-4)

12″ subwoofer · 4 Ω · 500 W RMS

Fs 28.2 HzQts 0.54Vas 3.98 ft³Xmax 0.28″

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 volume1.91 ft³ (54 L)
Qtc0.95
Fc49 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/2″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)35 Hz
Portslot 2 3/16 × 14 5/16″, 16 1/4″ long
Port velocity at 500 W60 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 5/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.2 Hz
Qts0.54
Qes0.62
Qms4.34
Vas3.98 ft³
Re3.14 Ω
Sd84.2 in²
Xmax0.28″
Vd23.2 in³ calc.
Mms118 g calc.
BL10.3 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m88.1 dB calc.

General

Size12″
Voice coils4 Ω
RMS power500 W

Mounting dimensions

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