JBL GTS100 Owner's Manual page 28

(continued)
Remote-on light is illuminated, but no
sound is heard from some or all of the
speakers.
Alternator whine through the audio
system with the engine running.
Bass output from speakers too low.
If you want to talk to us about any problems, call JBL Customer Service at
1-800-336-4JBL Between 9AM and 5PM Eastern time.
28
• Incorrect gain adjustment; verify that
the GTS100 gain controls are not
turned completely down. If they are,
sound output level may be very low
and may give the impression that the
system (or part of the system) is dead.
• Defective head unit or signal processor;
check each component for proper
wiring and operation.
• Defective GTS100; If there is audio
signal present at the inputs of the
GTS100 and there is no output, the
GTS100 may be defective.
• Ground loops; Follow the wiring
suggestions in the section called
"Solving Noise Problems." Also, verify
that the chassis grounding point you
have chosen is true ground by checking
for continuity between the chassis
ground point and battery ground.
• Speaker wired out of phase; check for
proper polarity on all speaker wiring
(+ amp terminal to + speaker terminal
and – amp terminal to – speaker
terminal.