Polycom SoundStructure C16 Design Manual page 510

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If the reference is set properly and includes all the remote audio sources and there is still an echo heard by

the remote participants, the next step is to understand how the amplifier output fader is set.

In some applications, the line level outputs of the SoundStructure could be connected to the inputs of a

microphone-only device that requires the outputs of the SoundStructure to be attenuated significantly to be

compatible with the microphone level inputs. If the output fader on the amplifier channel is used to attenuate

the amplifier signal as shown in the figure below and the AEC reference is also set to the amplifier output,

then the AEC reference would also be attenuated by the fader amount.

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