Rockford Fosgate Punch HE2 RFP2208 (2000)

8″ subwoofer · dual 4 Ω · 250 W RMS

Fs 35 HzQts 0.37Vas 0.46 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 250 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 volume0.32 ft³ (9 L)
Qtc0.58
Fc55 Hz
F3 (−3 dB, no cabin gain)72 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.64 ft³ (18 L)
Tuning (Fb)37 Hz
Portround port Ø2 1/2″, 13 1/2″ long
Port velocity at 250 W149 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)17 3/16″ × 15 3/4″ × 7 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.37
Qes0.394
Qms6
Vas0.46 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 33.3 in²
Xmax0.43″
EBP89 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.5 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 8 1/4″cutout Ø7 1/16″mounting depth 4 11/16″magnet Ø≈ 4 9/16″
Cutout diameter7 1/16″
Mounting depth4 11/16″

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 8″ models