21
Symptom
Likely Cause
What to do
Hum or Buzz.
Improper A/C grounding,
ground loops.
• “Telescope” the audio ground by using an XLR/F to
XLR/M adapter on one end.
• Re-route audio cable away from AC power and
lighting cables.
Excessively long
unbalanced cable run.
• Use the balanced outputs (if available) of your
mixer or source equipment to drive your PRX800
speakers.
• Use a “DI” (direct injection) box to convert your
unbalanced equipment output to a balanced
output.
Improper system gain
structure.
Review the Owner’s Manual for your system
setup and adjust controls as needed.
• Check input sensitivity (gain).
Speakers feedback and
howl when the microphone
volume is turned up.
Microphones are pointed
into the speakers.
Move the speakers so they do not point to the
microphone’s pickup pattern.
Equalizer settings are
incorrect.
Locate the feedback frequency and reduce it
using the mixer EQ or an external equalizer.
Excessive gain.
Reduce the gain at the mixer and move the
microphone closer to the sound source.
Too much low frequencies
when playing back pre-
recorded music.
Recorded music
with excessive low
frequencies.
Switch the SYSTEM EQ button to “Normal”.
Speaker is unresponsive.
System error may have
occurred.
• Power cycle the speaker.
• Perform the Factory Soft Reset, see
“FACTORY
RESETS” on page 19
.
Section 7: Connection Types
