Electro-Voice EVID 4.2 Installation Manual page 15

EVID Surface-mount loudspeakers
Problem
Intermittent output such as
crackling or distortion
Constant noise, such as
buzzing, hissing, humming
If none of these suggestions solves your problem, contact your nearest Electro-Voice
service center or Electro-Voice distributor.
Bosch Security Systems, LCC
Possible causes
Improperly wired subwoofer
panel
Faulty connection
Defective amplifier or other
electronic device
Poor system grounding or
ground loop
Installation manual
Troubleshooting | en
Action
the amplifier (-) terminal is
connected to the black
speaker terminals.
Using a test speaker, verify
that all amplifier and speaker
wires are connected to their
proper terminals with the
correct polarity. Reversing
just one set of amplifier wires
can cut out all bass output
from the subwoofer.
Check all connections at
amplifier and speakers to
ensure they are clean and
tight. If the problem persists,
it may be in the amplifier or
wiring. See other actions.
If the noise is present, but no
program material is playing,
the likely cause is the signal
chain in the electronics.
Evaluate each component as
necessary to isolate the
problem.
Check and correct the system
grounding, as required.
2023-07 | 04 | F.01U.177.642
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