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Symptom Diagnosis Remedy
Speaker Output Low
or Distorted
Input gain(s) for amplifier incorrectly set.
Source unit output too low or source unit
has no output.
Phase selection of amplifier incorrectly se-
lected or speakers wired out of polarity from
the left to right channel.
XCards are missing or not placed properly
in crossover slots and/or switches are not
properly selected.
Low battery voltage or large voltage drops
to the amplifier under load.
Amplifier Noise
(Turn-on Pop)
Voltage spike from output of preceding
component is entering amplifier through
input signal.
Voltage spike from remote turn-on lead is
entering through REM input terminal.
RCA Input from source unit is not connected
or not functioning properly.
When using the BLT, Balanced Line Input
from BLT is not connected or not function-
ing properly.
Unbalanced/Balanced Line switch is not
selected for corresponding input.
XCards are missing or not placed properly
in crossover slots.
Disconnect input signal to amplifier and
turn amplifier on and off. If noise is elimi-
nated, connect REM lead of amplifier to
source unit with a delay turn-on module.
Use different 12 volt source for REM lead of
amplifier (i.e., battery direct). If noise is
eliminated, use relay to isolate amplifier
from noise turn-on output.
Check connections, substitute with known
working source and cables and repair or
replace as necessary.
Check connections, substitute with known
working BLT and cables and repair or
replace as necessary.
Check switch position and correct as neces-
sary.
Check crossover switches and XCard posi-
tions and repair or replace as necessary.
No output from Pass-Thru out-
put of amplifier.
TROUBLE-
S
H
O
O
T
I
N
G
Readjust input gains of amplifier.
Check system with known working source
and repair or replace original source as
needed.
Check speaker polarity and phase switch
position and correct as needed.
Check crossover switches and XCard posi-
tions and repair or replace as necessary.
Check the alternator, battery, fuse or circuit
breaker and power and ground wiring and
repair as necessary.