Bomber Upgrade Evo 500W 4+4 Ohm (SW12UPEVO500-4)

12″ subwoofer · dual 4 Ω · 500 W RMS

Fs 47 HzQts 1.29Vas 1.04 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 volume1.73 ft³ (49 L)
Qtc1.63
Fc59 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)43 Hz
Portslot 2 9/16 × 14 5/16″, 13 1/16″ long
Port velocity at 500 W61 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 7/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs47 Hz
Qts1.29
Qes1.44
Qms12.6
Vas1.04 ft³
Re (one coil)3.31 Ω
Sd76.1 in²
Xmax0.28″
Vd21 in³ calc.
Mms133 g calc.
BL9.5 T·m calc.
EBP33 — suits sealed calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø12 1/16″cutout ≈ Ø10 13/16″mounting depth 5 15/16″magnet Ø6 5/8″
Cutout diameter≈ 10 13/16″
Mounting depth5 15/16″
Overall diameter12 1/16″
Magnet diameter6 5/8″

“≈” 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