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If none of the suggestions below solve your problem, contact your nearest
JBL
service center or
JBL
distributor.
Problem
Possible
Causekl
""""
Action
1.
No Output.
Speaker
Cable(s)
Replace the cable(s) connecting the loudspeaker system
and amplifier.
2.
Questionable or
intermittent output
such as crackling.
3.
Constant noise such as
buzzing, hissing, or
the humming sound.
Amplifier
A poor
connection
A faulty
electronic
device in the
signal chain
Poor system
grounding
4.
Poor low frequency Out-of-Polarity
output. Hookup
between multiple
speakers
Make sure the amplifier channel is being fed an input
signal (preferably via a "signal input" indicator on th
amp).
Check that the amplifier channel's volume control is
"""""
turned up.
Connect the speaker and cable which had no output
another amplifier channel, making sure an input sign
fed to the new amp channel. If you then get output, th
problem was the amplifier channel. If not, then the
problem may be in the cable or speaker.
Check all cabling for proper connector contact since a
bad connection can result in intermittent contact or
dramatically increased resistance which, in turn, can
"",
cause reduced output or noises unrelated to the signal.
Since loudspeakers cannot generate these sounds b
themselves, you may have a faulty electronic device
the signal chain.
a
Check and correct the system grounding, as required.
When two speakers are hooked up out-of-polarity ("out
of-phase"), the low frequencies cancel each other out.
Try reversing the polarity of one of the speakers eithe
by turning around a dual-banana plug at the amplifier
by reversing the tiplsleeve leads on the jack. Whicheve