Memphis Car Audio PRX8S4 (Power Reference 8" SVC 4ohm)

8″ subwoofer · 4 Ω · 200 W RMS

Fs 49.1 HzQts 0.72Vas 0.36 ft³Xmax 0.23″

Recommended box

For a sedan, one sub, 200 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 volume0.71 ft³ (20 L)
Qtc0.89
Fc60 Hz
F3 (−3 dB, no cabin gain)52 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 17 7/8″
Open sealed box in designer

Ported

Net volume1.24 ft³ (35 L)
Tuning (Fb)37 Hz
Portslot 1 9/16 × 14 5/16″, 31 3/4″ long
Port velocity at 200 W41 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs49.1 Hz
Qts0.72
Qes0.813
Qms6.43
Vas0.36 ft³
Re≈ 3.4 Ω
Sd32.3 in²
Xmax0.23″
Vd7.5 in³ calc.
Mms64 g calc.
BL9.1 T·m calc.
EBP60 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.7 dB calc.

General

Size8″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø8 5/8″cutout Ø6 15/16″mounting depth 3 7/8″magnet Ø5″
Cutout diameter6 15/16″
Mounting depth3 7/8″
Overall diameter8 5/8″
Magnet diameter5″

“≈” 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 Memphis Car Audio 8″ models