Rockford Fosgate Punch P2D4-15

15″ subwoofer · dual 4 Ω · 400 W RMS

Fs 20.9 HzQts 0.65Vas 7.76 ft³Xmax 0.48″

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 volume3.14 ft³ (89 L)
Qtc1.22
Fc39 Hz
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 13 1/8″
Open sealed box in designer

Ported

Net volume5.37 ft³ (152 L)
Tuning (Fb)30 Hz
Portslot 1 15/16 × 16 5/16″, 13 1/16″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 22 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs20.9 Hz
Qts0.65
Qes0.74
Qms5.7
Vas7.76 ft³
Re (one coil)3.2 Ω
Sd138.6 in²
Xmax0.48″
Vd66.6 in³ calc.
Mms299 g calc.
BL13 T·m calc.
EBP28 — suits sealed calc.
Sensitivity, 1 W / 1 m86.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø≈ 15 1/16″cutout Ø13 7/8″mounting depth 7 3/8″magnet Ø≈ 9 1/16″
Cutout diameter13 7/8″
Mounting depth7 3/8″

“≈” 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 15″ models