How to keep audio quality high for the meeting?

Hi, we have an audio-first meeting, where a small number of publishers (like webinar panelists) have small video resolution but do not publish to all (but only fellow publishers). The receivers (webinar audience) only received audios. The issue is audio quality degraded dramatically when multi-panelists speak at the same time (our application requires this). So my question is how to keep (force) the audio quality (bitrate) high? Any concrete implementation pointers are welcomed! Thank you.

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