Owner`s manual

Electro-Voice Live X Series Powered Owner’s Manual18
Troubleshooting
Problem Possible Cause(s) Action
1. No Sound Amplifier Connect a known working test speaker to the amplifier outputs. If there is no
sound, check that all the electronics are on, the signal routing is correct, the
source is active, the volume is turned up, and so on. Correct/repair/replace
as necessary. If there is sound, the problem is in the wiring.
Wiring Verify that you have connected the correct wire pairs to the amplifier. Play some-
thing at low level through the amplifier (for example, from a CD player or tuner).
Connect the test speaker in parallel with the malfunctioning line. If the sound level
has gone or is very weak, the line has a short in it (possibly a severe scrape, pinch,
or staple puncture). If the sound level is normal, the wire is open (possibly a cut
wire or a missed connection). Using the test speaker, move down the line and test
each connection/junction until you find the problem and correct it. Observe proper
polarity.
2. Poor LowFre-
quency
Response
WITH SUB switch
activated
Set the FULL RANGE / WITH SUB switch to the FULL RANGE position.
3. Intermittent output
such as crackling
or distortion
Faulty Connection Check all connections at amplifier and speakers to ensure they are all clean and
tight. If the problem persists, it may be in the amplifier or wiring. See Problem 1
above.
4. Constant noise
such as buzzing,
hissing, humming
Defective source
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.
Incorrect gain
structure
Verify level controls of the source are properly structured. Verify MIC/LINE switch
is in the correct position.
5. No sound pro-
duced with micro-
phone connected to
input 2
Microphone requires
phantom power
Use a dynamic microphone that does not require phantom power. If using a mi-
crophone that requires phantom power, an external phantom power source will be
needed.
MIC / LINE switch is
in LINE position
Set the MIC/LINE switch to the MIC position.
6. Sound is distorted.
LIMIT LED is con-
stantly on or flashing
regularly
Excessive input level Reduce the input level or loudspeaker level knobs to prevent limit.
Line level source con-
nected to INPUT 2
with MIC/LINE switch
in MIC position
Set the MIC/LINE switch to the LINE position.
7. Sound is distorted.
LIMIT LED is not
blinking
Source input (mixing
console/preamp) is
overdriven
Verify level controls of the source are properly structured.
8. Microphone
produces acoustic
feedback when input
level is amplified.
Incorrect gain struc-
ture
Reduce the microphone levels at the mixing console or input source. If the micro-
phone is connected directly to the speaker reduce the input level on the speaker.
Positioning the microphone close to the sound source will increase gain-before-
feedback.
NORMAL/BOOST
switch is in the
BOOST position
Set the NORMAL/BOOST switch to the NORMAL position for vocal applications.
Microphone position
is too close to the
front of the speaker
Whenever possible setup the speakers so the microphone is behind them. If using
the speakers in a monitor position aim the speaker to the back of the microphone.
If these suggestions do not solve your problem, contact your nearest Electro-Voice dealer or Electro-Voice distributor.