Polycom SoundStructure C16 Design Manual page 502

Automixer Settings for Room 2 Microphones
No adjustments need to be made to the echo canceller references because the microphones were
configured earlier to use their respective room amplifiers as the AEC reference.
The next step is to save the settings to a new preset and to label that preset "Split".
Finally, the preset "Power-On" can be removed as those settings do not represent a valid configuration for
this design since it contains the settings prior to creating the combined configuration.
Finally, confirm that there is a power on preset - in this example it should be set to be the "Combine" preset
as shown in the following figure.
Polycom, Inc. 502