Memphis Car Audio PRX1244 (Power Reference 12" DVC 4ohm)

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 35 HzQts 0.64Vas 1.80 ft³Xmax 0.55″

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 volume1.70 ft³ (48 L)
Qtc0.92
Fc50 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 5/8″
Open sealed box in designer

Ported

Net volume2.86 ft³ (81 L)
Tuning (Fb)35 Hz
Portslot 1 3/4 × 14 5/16″, 15 3/16″ long
Port velocity at 300 W58 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.64
Qes0.73
Qms5.37
Vas1.80 ft³
Re (one coil)≈ 3.4 Ω
Sd73.7 in²
Xmax0.55″
Vd40.6 in³ calc.
Mms130 g calc.
BL11.5 T·m calc.
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m86.8 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

12 9/16″ × 12 9/16″cutout 11″mounting depth 5 9/16″magnet Ø6 7/16″
Cutout (square, side)11″
Mounting depth5 9/16″
Overall diameter12 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 12″ models