Appendix B - Troubleshooting - Electro-Voice C12.2 User Manual

Appendix B - Troubleshooting

Problem Possible Causes Action
Amplifier
No Output
Speaker Cable(s)
Questionable Faulty Connection Check all cabling for proper connector contact. A
or Intermittent
Output such
as Crackling
Improper Power
Tap Setting
Constant A Faulty
Noise such Electronic Device
as Buzzing, in the Signal
Hissing or Chain
Humming
Poor System
Grounding
Poor Low- Out-of-Polarity
Frequency Hookup Between
Output Multiple Speakers
If none of the suggestions solves your problem, contact your nearest Electro-Voice
service center or Electro-Voice distributor.
EVID C12.2 Ceiling Speaker Installation and Operations Manual
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 imput signal is fed to the new ampl 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.
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.
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