Audison Prima APBMW S8-2.2 (BMW/MINI underseat, SVC 2 ohm)

8″ subwoofer · 2 Ω · 150 W RMS

Fs 40 HzQts 0.51Vas 0.79 ft³Xmax 0.28″

Recommended box

For a sedan, one sub, 150 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 volume0.53 ft³ (15 L)
Qtc0.80
Fc63 Hz
F3 (−3 dB, no cabin gain)60 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 12 15/16″
Open sealed box in designer

Ported

Net volume1.20 ft³ (34 L)
Tuning (Fb)38 Hz
Portslot 1 9/16 × 14 5/16″, 30 7/8″ long
Port velocity at 150 W31 ft/s
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40 Hz
Qts0.51
Qes0.67
Qms2.1
Vas0.79 ft³
Re2.2 Ω
Sd30.8 in²
Xmax0.28″
Vd8.5 in³ calc.
Mms40 g calc.
BL5.7 T·m calc.
EBP60 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size8″
Voice coils2 Ω
RMS power150 W

Mounting dimensions

Ø≈ 8 1/2″cutout ≈ Ø7 5/16″mounting depth ≈ 3 15/16″magnet Ø≈ 4 3/4″
Cutout diameter≈ 7 5/16″
Mounting depth≈ 3 15/16″

“≈” 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 Audison 8″ models