Rockford Fosgate Punch HX2 RFD1215 (2000)

15″ subwoofer · dual 4 Ω · 600 W RMS

Fs 24 HzQts 0.48Vas 7.06 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 600 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 volume2.83 ft³ (80 L)
Qtc0.90
Fc45 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)32 Hz
Portslot 2 3/8 × 16 5/16″, 15 13/16″ long
Port velocity at 600 W63 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24 Hz
Qts0.48
Qes0.522
Qms6
Vas7.06 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 124 in²
Xmax0.55″
EBP46 — suits sealed calc.
Sensitivity, 1 W / 1 m89.2 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power600 W

Mounting dimensions

Ø≈ 15″cutout Ø13 13/16″mounting depth 6 15/16″magnet Ø≈ 9″
Cutout diameter13 13/16″
Mounting depth6 15/16″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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