JBL EON PowerSub G2 User Manual page 12

Signal sounds distorted even
at moderate volumes, PEAK
light is not lit.
Hum or Buzz that increases
or decreases when the mixer
level controls are moved.
Hum or Buzz
Speakers feedback and howl
when the microphone volume
is turned up
Mixer or other source is overdriven
Improper A/C ground or faulty
equipment connected to mixer
input
Faulty cable between source
equipment and mixer
Improper A/C grounding, ground
loops
Excessively long unbalanced cable
run
Improper system gain structure
Microphones are pointed into the
speakers
Equalizer settings are incorrect
Excessive gain
Review the Owner's Manual
for your mixer and adjust
controls as needed
• Input sensitivity (gain)
• Channel faders
• Master faders
Disconnect or mute
channels one at a time to
isolate the problem. Refer
to the owner's manual of the
faulty equipment for
troubleshooting help.
Substitute a known-good
cable for the suspected
faulty cable.
• Connect all speakers to a
common power circuit.
• "Telescope" the audio
ground by using an XLR/F
to XLR/M adapter with
Pin1 disconnected on one
end.
• Re-route audio cables
away from AC power and
lighting cables.
• Use the balanced outputs
(if available) of your mixer
or source equipment to
drive your EON speakers.
• Use a "DI" (direct injection)
box to convert your unbal-
anced equipment output
to a balanced output.
Reduce the INPUT 1, LINE
2, and LINE 3 controls and
increase the output level of
your source devices.
Move the speakers so they
do not point into the micro-
phone's pick-up pattern.
Locate the feedback fre
quency and reduce it using
the mixer EQ or an external
equalizer.
Reduce the gain at the
mixer and move the micro-
phone closer to the sound
source.
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