Rockford Fosgate 100X2 Owner's Manual page 25

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 amplifier is 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
fins 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 2 as described on page 14. Using an
AC impedance meter (Perfect Interface IM-1), sweep
from 20 Hz - 20 kHz, and look for dips below the 2
rating.
Be sure to test the bass region (20 Hz - 150 Hz) 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 2 , 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 Fosgate Dealer for more infor-
mation.)
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
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