Bomber Slim TKL 400W 4 Ohm (SW12STKL400-4)

12″ subwoofer · 4 Ω · 400 W RMS

Fs 32 HzQts 0.43Vas 1.94 ft³Xmax 0.31″

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 volume0.78 ft³ (22 L)
Qtc0.81
Fc60 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume2.58 ft³ (73 L)
Tuning (Fb)32 Hz
Portslot 1 15/16 × 14 5/16″, 24 3/16″ long
Port velocity at 400 W59 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.43
Qes0.46
Qms6.7
Vas1.94 ft³
Re3.18 Ω
Sd81.1 in²
Xmax0.31″
Vd25.5 in³ calc.
Mms174 g calc.
BL15.6 T·m calc.
EBP70 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.9 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 7/16″cutout ≈ Ø11 3/16″mounting depth 4 1/16″magnet Ø6 1/8″
Cutout diameter≈ 11 3/16″
Mounting depth4 1/16″
Overall diameter12 7/16″
Magnet diameter6 1/8″

“≈” 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