Rockford Fosgate Punch P115S4 (Stage-1, 2004)

15″ subwoofer · 4 Ω · 200 W RMS

Fs 24 HzQts 0.62Vas 6.07 ft³Xmax 0.31″

Recommended box

For a sedan, one sub, 200 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 volume3.04 ft³ (86 L)
Qtc1.07
Fc42 Hz
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12 3/4″
Open sealed box in designer

Ported

Net volume5.16 ft³ (146 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 16 5/16″, 9 11/16″ long
Port velocity at 200 W55 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 7/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24 Hz
Qts0.62
Qes0.67
Qms7.54
Vas6.07 ft³
Re3.6 Ω
Sd133 in²
Xmax0.31″
Vd41.9 in³ calc.
Mms267 g calc.
BL14.7 T·m calc.
EBP36 — suits sealed calc.
Sensitivity, 1 W / 1 m87.5 dB calc.

General

Size15″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø15 7/16″cutout Ø13 7/8″mounting depth 7 1/8″magnet Ø≈ 9″
Cutout diameter13 7/8″
Mounting depth7 1/8″
Overall diameter15 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 Rockford Fosgate 15″ models