Rockford Fosgate Punch P3SD412 (Shallow, 2007)

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 45 HzQts 0.74Vas 0.74 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 400 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 volume1.48 ft³ (42 L)
Qtc0.90
Fc55 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 7 13/16″
Open sealed box in designer

Ported

Net volume2.72 ft³ (77 L)
Tuning (Fb)34 Hz
Portslot 2 3/16 × 14 5/16″, 21 13/16″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45 Hz
Qts0.74
Qes0.88
Qms4.6
Vas0.74 ft³
Re (one coil)3.4 Ω
Sd69.8 in²
Xmax0.43″
Vd29.7 in³ calc.
Mms171 g calc.
BL13.7 T·m calc.
EBP51 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.4 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 3 5/8″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth3 5/8″

“≈” 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