Rockford Fosgate Punch HE2 RFP4112

12″ subwoofer · dual 2 Ω · 400 W RMS

Fs 27 HzQts 0.58Vas 2.08 ft³Xmax 0.51″

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 volume1.80 ft³ (51 L)
Qtc0.84
Fc40 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)28 Hz
Portslot 1 15/16 × 14 5/16″, 26 15/16″ long
Port velocity at 400 W59 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.58
Qes0.62
Qms7.96
Vas2.08 ft³
Re (one coil)1.65 Ω
Sd79.1 in²
Xmax0.51″
Vd40.5 in³ calc.
Mms217 g calc.
BL9.9 T·m calc.
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m84.7 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power400 W

Mounting dimensions

Ø12 3/8″cutout Ø11 1/8″mounting depth 6 5/16″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth6 5/16″
Overall diameter12 3/8″

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 12″ models