Rockford Fosgate Punch HE2 RFP4215

15″ subwoofer · dual 4 Ω · 500 W RMS

Fs 23 HzQts 0.74Vas 5.10 ft³Xmax 0.51″

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 volume2.86 ft³ (81 L)
Qtc1.23
Fc38 Hz
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12 1/8″
Open sealed box in designer

Ported

Net volume4.84 ft³ (137 L)
Tuning (Fb)30 Hz
Portslot 1 15/16 × 16 5/16″, 15″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 3/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23 Hz
Qts0.74
Qes0.82
Qms7.2
Vas5.10 ft³
Re (one coil)3.37 Ω
Sd124.9 in²
Xmax0.51″
Vd63.9 in³ calc.
Mms305 g calc.
BL13.5 T·m calc.
EBP28 — suits sealed calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø15 5/16″cutout Ø13 7/8″mounting depth 7 11/16″magnet Ø≈ 9″
Cutout diameter13 7/8″
Mounting depth7 11/16″
Overall diameter15 5/16″

Judging by its value, the published Re is for both coils in series — converted to per coil.

“≈” 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