Rockford Fosgate Punch P312D2 (Stage-3, 2004)

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 27 HzQts 0.48Vas 1.55 ft³Xmax 0.47″

Recommended box

For a sedan, one sub, 500 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 volume0.88 ft³ (25 L)
Qtc0.80
Fc45 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11 15/16″
Open sealed box in designer

Ported

Net volume2.72 ft³ (77 L)
Tuning (Fb)25 Hz
Portslot 1 15/16 × 14 5/16″, 40″ long
Port velocity at 500 W62 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.48
Qes0.52
Qms6.16
Vas1.55 ft³
Re (one coil)1.7 Ω
Sd70.1 in²
Xmax0.47″
Vd33.1 in³ calc.
Mms229 g calc.
BL11.3 T·m calc.
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø12 7/8″cutout Ø10 13/16″mounting depth 6 3/8″magnet Ø≈ 7 1/16″
Cutout diameter10 13/16″
Mounting depth6 3/8″
Overall diameter12 7/8″

“≈” 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 Rockford Fosgate 12″ models