JBL Speaker System manual Possible ProblemCausekl No Output

If none of the suggestions below solve your problem, contact your nearest JBL service center or JBL distributor.

Possible

ProblemCausekl

1. No Output.	Speaker
	Cable(s)
	Amplifier

2.	Questionable or	A poor
	intermittent output	connection
	such as crackling.
3.	Constant noise such as	A faulty
	buzzing, hissing, or	electronic
	the humming sound.	device in the
		signal chain
		Poor system
		grounding
4.	Poor low frequency	Out-of-Polarity
	output.	Hookup
		between multiple
		speakers

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Action

Replace the cable(s) connecting the loudspeaker system and amplifier.

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 volumecontrol is

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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 unrelatedto the signal.

Since loudspeakers cannot generate these sounds b themselves, you may have a faulty electronic device the signal chain.

aCheck and correct the system grounding, as required.

When two speakers are hooked up out-of-polarity ("out of-phase"), the low frequenciescancel 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