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Appendix B - Troubleshooting Table
Problem
No Output
Questionable
or Intermittent
Output such as
Crackling
Constant Noise
such as Buzz-
ing, Hissing, or
Humming
Poor Low-
Frequncy
Output
If none of the suggestions above solves your problem, contact your nearest EV© service
center or EV distributor.
EVID™ FM Series Installation and Operation Manual
Possible Causes
Amplifier
Speaker Cable(s)
Faulty Connection
Improper Power Tap
Setting
A Faulty Electronic
Device in the Signal
Chain
Poor System Ground-
ing
Out-of-Polarity
Hookup Between
Multiple Speakers
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, mak-
ing 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 loud-
speaker 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 ap-
propriate 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 po-
larity 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.
11
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