Rockford Fosgate Punch 40I Owner's Manual page 19

Problem
Amplifier gets too hot.
Solution
1. Be sure the amplifier is properly mounted. You should be able to
place your hand a few inches above the amplifier housing and feel
the heat rising when the unit is on.
2. Be sure the amplifie ris properly vented. An ideal situation is to have
the air flow through the heatsink fins. Hot air rises, so mount the
heatsink by aligning the fins vertically. This allows the air to flow
freely, carrying away the heat. Check to see that the heatsink
are free of any obstruction (i.e., carpet, seats, etc.).
3. Check to see that the impedance of the overall system is not less
than 2Q as described on page 11. Using an AC impedance meter
(Perfect Interface IM-1), sweep from 20Hz - 20kHz, and look for
dips below the 251 rating.
Be sure to test the bass region (20Hz - 150Hz) of your system. If the
amplifier is bridged to those speakers, the load the amp sees is one-
half (1/2) of the reading on the AC impedance meter.
If the impedance level is below 2Q check for bad speakers and/or
crossovers, proper use of passive crossovers, or try rewiring the
entire system.
Problem
Amplifier Noise (Turn-On Pop)
Solution
1. Disconnect the RCA plugs from the amplifier and recheck the amp
by turning the unit on and off. If turn-on pop goes away, connect
a delay turn-on module (Perfect Interface DT-1) to the amplifier.
(See your Authorized Rockford
tion.)
2. Disconnect the turn-on wire from the head unit and use a different
12 volt power source to turn on the amplifier (i.e., battery direct).
If the noise is gone, use a relay to switch from the clean power
source.
Fosgate Dealer for more informa-
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