EVID Surface-mount loudspeakers Troubleshooting | en 15
Bosch Security Systems, LCC
Installation manual
2023-07 | 04 | F.01U.177.642
Problem Possible causes Action
the amplifier (-) terminal is
connected to the black
speaker terminals.
Improperly wired subwoofer
panel
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.
Intermittent output such as
crackling or distortion
Faulty connection 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.
Constant noise, such as
buzzing, hissing, humming
Defective amplifier or other
electronic device
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.
Poor system grounding or
ground loop
Check and correct the system
grounding, as required.
If none of these suggestions solves your problem, contact your nearest Electro-Voice
service center or Electro-Voice distributor.
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