Appendix C - Troubleshooting Table - Electro-Voice EVID Ceiling Speaker Systems Installation And Operation Manual

Troubleshooting Table
Problem
No output
Questionable or
intermittent out-
put such as
crackling
Constant noise
such as buzzing, device in the
hissing, or
humming
Poor low-
frequency
output
If none of the suggestions below solves your problem, contact your nearest EV
or EV distributor.
12
Appendix C — Troubleshooting Table
Possible Causes
Amplifier
Speaker cable(s)
Faulty connection
Improper power
tap setting
A faulty electronic
signal chain
Poor system
grounding
Out-of-polarity
hookup between
multiple speakers
EVID™ Ceiling Series Installation and Operation Manual
Action
Make sure the amplifier channel is being fed an input
signal (preferably via a "signal input" indicator on the
amp).
Check that the amplifier channel's volume is turned up.
Connect the speaker and cable, which had no output
to another amplifier channel, making sure an input
signal is fed to the new amp channel. If you then get
output, the problem was the amplifier channel. If not,
then the problem may be in the cable or speaker.
Replace the cable(s) connecting the loudspeaker
system and amplifier.
Check all cabling for proper connector contact. 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.
Check the power tap setting under the speaker grille to
ensure the setting is appropriate for the installation and
amplifier chosen.
Since loudspeakers cannot generate these sounds by
themselves, you may have a faulty electronic device in
the signal chain.
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 either
by turning around a dual-banana plug at the amplifier
or by reversing the tip/sleeve leads on the jack.
Whichever condition results in greater low-frequency
output is the in-polarity condition.
©
service center