Memphis Car Audio PRX154 (Power Reference 15" SVC 4ohm)

15″ subwoofer · 4 Ω · 350 W RMS

Fs 27 HzQts 0.82Vas 4.33 ft³Xmax 0.51″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 350 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 volume2.90 ft³ (82 L)
Qtc1.29
Fc43 Hz
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12 1/4″
Open sealed box in designer

Ported

Net volume4.91 ft³ (139 L)
Tuning (Fb)34 Hz
Portslot 1 3/4 × 16 5/16″, 9 3/16″ long
Port velocity at 350 W63 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.82
Qes1
Qms4.53
Vas4.33 ft³
Re≈ 3.4 Ω
Sd126.4 in²
Xmax0.51″
Vd64.7 in³ calc.
Mms267 g calc.
BL12.4 T·m calc.
EBP27 — suits sealed calc.
Sensitivity, 1 W / 1 m85.8 dB calc.

General

Size15″
Voice coils4 Ω
RMS power350 W

Mounting dimensions

15 9/16″ × 15 9/16″cutout 13 13/16″mounting depth 6 3/4″magnet Ø6 7/16″
Cutout (square, side)13 13/16″
Mounting depth6 3/4″
Overall diameter15 9/16″
Magnet diameter6 7/16″

“≈” 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 Memphis Car Audio 15″ models