Rockford Fosgate Punch P2D2-8

8″ subwoofer · dual 2 Ω · 250 W RMS

Fs 39.6 HzQts 0.47Vas 0.35 ft³Xmax 0.31″

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)
Qtc0.68
Fc57 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.67 ft³ (19 L)
Tuning (Fb)35 Hz
Portround port Ø2 1/2″, 14 3/8″ long
Port velocity at 250 W147 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)17 7/16″ × 15 3/4″ × 7 5/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.6 Hz
Qts0.47
Qes0.51
Qms5.4
Vas0.35 ft³
Re (one coil)1.7 Ω
Sd34.3 in²
Xmax0.31″
Vd10.5 in³ calc.
Mms113 g calc.
BL9.7 T·m calc.
EBP78 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.8 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power250 W

Mounting dimensions

Ø≈ 8 5/16″cutout Ø7 1/8″mounting depth 4 3/4″magnet Ø≈ 4 5/8″
Cutout diameter7 1/8″
Mounting depth4 3/4″

“≈” 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