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Troubleshooting
Problem Possible Cause(s) Action
1. No Sound Amplifier Connect a known working test loudspeaker to the amplifier
outputs. If there is no sound, verify all the electronics are
on, the signal routing is correct, the source is active; the
volume is turned up, etc. Correct/repair/replace as
necessary. If there is sound, the problem is wiring.
Wiring Verify you have connected the correct cables to the
amplifier. Play something at a low level through the
amplifier. Connect the test loudspeaker in parallel with the
malfunctioning line. If the sound level is gone or is very
weak, the line has a short in it (possibly a severe scrape,
pinch, or a missed connection). Using the test loudspeaker,
move down the line and test each connection/junction until
you find the problem and correct it. Observe proper
polarity.
2. Poor
Low-
Frequency
Response
With SUB menu-
cross-over frequency
activated
If no subwoofers are used with the system, select the OFF
position. For more information, see Full-Range loudspeaker
DSP control menu, page 29.
3. Intermittent
output such
as cracking or
distortion
Faulty Connection Check all connections at amplifier and loudspeakers to
ensure they are all clean and tight. If the problem persists,
check the wiring. See problem 1.
4. Constant
noise such as
buzzing,
hissing or
humming
Defective source or
other electronic
device
If noise is present, but no program material is playing,
evaluate each component as necessary to isolate the
problem. Most likely there is a break in the signal path.
Poor system
grounding or ground
loop
Check and correct the system grounding, as required.
Input gain knob is
not in the MIC
position
Slowly increase the input gain knob level to engage the
microphone pre-amp.
5. No sound
produced with
microphone
connected to
INPUT 1 or
INPUT 2
Microphone requires
phantom power
Use a dynamic microphone that does not require phantom
power. If using a microphone requiring phantom power, an
external phantom power source is needed.
Input gain knob is
not in the MIC
position
Slowly increase the input gain knob level to engage the
microphone pre-amp.
6. Sound is
distorted front
LED is OFF,
LCD screen
LIMIT is ON
Excessive input level Reduce the input level or loudspeaker level knobs to
prevent limit.
5
ETX Powered Loudspeakers
2014.07 | 04 | F.01U.276.083 User Manual Electro-Voice
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