Audison Prima APS 8 R (SVC 4 ohm, reflex)

8″ subwoofer · 4 Ω · 250 W RMS

Fs 32 HzQts 0.40Vas 0.94 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 250 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 volume0.32 ft³ (9 L)
Qtc0.79
Fc64 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.99 ft³ (28 L)
Tuning (Fb)34 Hz
Port2 round ports Ø2 1/2″, 21 1/2″ long
Port velocity at 250 W83 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 6 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
Qts0.40
Qes0.43
Qms5.1
Vas0.94 ft³
Re3.7 Ω
Sd36.4 in²
Xmax0.35″
Vd12.6 in³ calc.
Mms73 g calc.
BL11.2 T·m calc.
EBP74 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.1 dB calc.

General

Size8″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø8 3/4″cutout Ø7 3/8″mounting depth 3 1/8″magnet Ø4 3/4″
Cutout diameter7 3/8″
Mounting depth3 1/8″
Overall diameter8 3/4″
Magnet diameter4 3/4″

“≈” 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 Audison 8″ models