Update Your Sonos to 15.2 if you are using an ERA 300 in your setup. NOW! 

This is my experience with Sonos S2 version 15.2 and why it matters. Especially to Sonos Era 300 users. I also address the issue that many are finding with their Era 300's center driver not in use when deployed as surrounds. This also serves as an update to my take on the Era 300 after the 15.2 update with special attention to Atmos.
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