Mac Mini M1 sound quality

I finally figured out the cause of this issue. When I have audio playing on the Mac and another application is trying to use the microphone the audio quality drops down.

For example:

I am streaming music from the Internet using the Music app, when I open a remote desktop connection to my Windows laptop and I have microphone box checked as one of the devices to share in the remote session the audio quality drops. When I disable the mic option in the RDC app the audio quality is fine. The same thing happens when I start a audio/video call with Microsoft Teams or Webex.

With additional testing I found that this only happens with I have my Poly Sync20 connected to the Mac and its being used as the input device. When I change the input device to the mic attached to my webcam or another speakerphone device the audio quality is fine.

I guess the Poly Sync20 is trying to reduce background audio when its mic is in use. I'll be reaching out to Poly to see this is expected behavior or possibly a bug in the firmware.

Thanks, I thought it may be the usb hub I use, but this happens with direct connected usb and usb-c as well as direct connected Bluetooth (no usb Bluetooth dongle)