JBL SRX818SP - Troubleshooting Common Issues

34
Symptom Likely Cause What to do
No sound
Speaker not connected
to active AC power
Verify that speaker is connected and that the circuit is on
Power not switched on Switch on power and verify that power LED is on
No sound, speaker is connected
to working AC power but won’t
come on.
Speaker power cable is faulty
or improperly connected.
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No sound. Speaker comes on.
Signal source
(mixer, instrument, etc.)
is not sending.
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sending an audio signal
Faulty cables and
connections
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No sound with microphone
connected directly to the input.
Microphone requires
phantom power
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microphone, use a battery powered microphone (if possible),
use an external phantom power supply for condenser type microphones.
Signal sounds distorted and
very loud, PEAK light is lit
most of the time.
Excessive input signal, trying
to exceed the capabilities of
the speakers
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Signal sounds distorted even at
moderate volumes, LIMIT light
is not lit.
Mixer or other source
is overdriven
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Start section of this guide.
Lots of hiss in the sound,
the mixer controls are at
very low settings.
Improper gain structure
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Noise or hiss heard at output. Noisy source device
Disconnect the devices that are connected to your speaker one at a time.
If the noise goes away, the problem is with the source or the
connecting cable.
Hum or Buzz that increases or
decreases when the mixer level
controls are moved.
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faulty equipment connected
to mixer input
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the owner’s manual of the faulty equipment for troubleshooting help.
Faulty cable between source
equipment and mixer
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Hum or Buzz
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ground loops
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Excessively long
unbalanced cable run
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output to a balanced output.
Improper system gain
structure
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source devices.
TROUBLESHOOTING