Bomber Slim High Power 300W 4 Ohm (SW8SLHP-300-4)

8″ subwoofer · 4 Ω · 300 W RMS

Fs 47 HzQts 0.66Vas 0.34 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 volume0.67 ft³ (19 L)
Qtc0.81
Fc58 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 15 13/16″
Open sealed box in designer

Ported

Net volume1.27 ft³ (36 L)
Tuning (Fb)34 Hz
Portslot 1 9/16 × 14 5/16″, 37 1/8″ long
Port velocity at 300 W52 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 5/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs47 Hz
Qts0.66
Qes0.71
Qms10.1
Vas0.34 ft³
Re4.4 Ω
Sd33.2 in²
Xmax0.24″
Vd7.8 in³ calc.
Mms77 g calc.
BL11.9 T·m calc.
EBP66 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.5 dB calc.

General

Size8″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø8 3/8″cutout ≈ Ø7 9/16″mounting depth 3″magnet Ø5 1/4″
Cutout diameter≈ 7 9/16″
Mounting depth3″
Overall diameter8 3/8″
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 8″ models