Rockford Fosgate Punch PCH-124 (1992)

12″ subwoofer · 4 Ω · 100 W RMS

Fs 32 HzQts 0.29Vas 4.70 ft³Xmax 0.19″

Recommended box

For a sedan, one sub, 100 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 volume0.78 ft³ (22 L)
Qtc0.77
Fc85 Hz
F3 (−3 dB, no cabin gain)84 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume2.05 ft³ (58 L)
Tuning (Fb)44 Hz
Portslot 1 9/16 × 14 5/16″, 11 5/16″ long
Port velocity at 100 W35 ft/s
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.29
Qes0.31
Qms4.79
Vas4.70 ft³
Re3.6 Ω
Sd83.7 in²
Xmax0.19″
Vd15.5 in³ calc.
Mms77 g calc.
BL13.4 T·m calc.
EBP103 — suits ported calc.
Sensitivity, 1 W / 1 m93.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power100 W

Mounting dimensions

Ø12 1/8″cutout Ø11″mounting depth 5 1/8″magnet Ø≈ 7 1/8″
Cutout diameter11″
Mounting depth5 1/8″
Overall diameter12 1/8″

“≈” 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