Rockford Fosgate 4-CHANNEL AMPLIFIER - Manual (Page 29)

26
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.
Hot air rises, consequently, mount the amplifier with
the heatsink fins aligned 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.).
2. If #1 does not solve the problem, check to see that the
impedance of the overall system is not less than 2
Ω
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
Ω
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
Ω
, 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. If the noise persists, 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 +12 volts auto power
from the clean power source.