Rockford Fosgate Punch P1S4-12

12″ subwoofer · 4 Ω · 250 W RMS

25 HzFs, resonance
0.48Qts
3.12 ft³Vas
0.35″Xmax
250 WRMS
The published specs don’t add up:

Recommended box

For a sedan, one sub, 250 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

smaller, tighter
1.77 ft³ (50 L)
Net volume
Qtc0.80
Fc42 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 15/16″
Open sealed box in designer

Ported

deeper, louder
3.28 ft³ (93 L)
Net volume
Tuning (Fb)28 Hz
Portslot 1 9/16 × 14 5/16″, 19 1/2″ long
Port velocity at 250 W57 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25 Hz
Qts0.48
Qes0.56
Qms3.4
Vas3.12 ft³
Re3.6 Ω
Sd84.9 in²
Xmax0.35″
Vd30.1 in³ calc.
Mms195 g calc.
BL14 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m85.9 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 1/4″mounting depth 6″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6″

“≈” 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