Near-end microphone and far-end input channels should have the gain set for a signal level of around 0 dBu.
If a near-end speaker is too loud, turn down its ‘Zone’ fader or the power amplifier, not the input channel/microphone gain.
Ensure that there are no compressors or gates in the AEC path
There should be no compression or gating between the AEC far-end insert point and the near-end speaker.
There should similarly be no compression or gating between the near-end microphone and the AEC near-end insert.
The ‘no compression/gate’ area is outlined in green in the diagram. Compressors and gates can exist to the left of this block.
Manage room volume
The near-end speaker volume as captured by the near-end microphone should be lower than the volume of a person talking into the near-end microphone.
Reduce feedback
In multi-room venues with low system latency, it is important to ring out the system and make sure there is good gain before feedback.
It is OK to achieve this using PEQ bands. Remember to maintain a good signal level in the input channels.
Reduce persistent background noise
The AEC’s built-in background noise reduction can give a useful intelligibility boost, but nothing beats addressing background noises at their source where possible.
High-pass filters in an Input channel or ‘Zone’ can reduce low-frequency rumble from HVAC.
Use comfort noise
By setting the comfort noise to a level similar to the background noise level of the near-end room, the far-end caller will hear a more natural and consistent sound.
Use the ‘SR’ output for sound reinforcement applications
This takes the echo-cancelled signal before the far-only ducking and comfort noise.
High ‘Echo reduction’ or ‘Noise reduction’ settings are unsuitable for SR applications.
