Polycom HDX Series Administrator's Manual page 148

Administrator's Guide for Polycom HDX Systems
Symptom
Voices at the near site
sound distorted through the
speakers at the near site.
The Audio Meter screen
shows a reading for
Polycom Mic but no
microphone is connected -
the system receives local
audio from a mixer.
12 - 18
Problem
The far site has distorted
audio from the far-site
speakers.
The far site's distorted
audio is often caused by
overloading the input stage
of the far site's audio
amplifier.
Echo cancellation is in use.
The system displays the
audio line input level in this
case.
Corrective action
Ask the far site to reduce their Polycom HDX system
volume control to about 25, and to increase their
external audio amplifier volume control to maintain
the same loudness.
This is normal.