Rockford Fosgate Punch HE2 RFP4212

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 29 HzQts 0.62Vas 1.93 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)
Qtc0.89
Fc42 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)30 Hz
Portslot 1 15/16 × 14 5/16″, 22 7/8″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29 Hz
Qts0.62
Qes0.68
Qms7.15
Vas1.93 ft³
Re (one coil)3.2 Ω
Sd79.1 in²
Xmax0.51″
Vd40.5 in³ calc.
Mms203 g calc.
BL13.2 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m84.9 dB calc.

General

Size12″
Voice coilsdual 4 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