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How do you control the volume on the 300 without raising the volume on the sound bar at the same time?

I assume that you’re using the 300’s as Surrounds.

Try this link for assistance 

https://support.sonos.com/en-us/article/change-surround-audio-settings

When the speakers are part of a surround set up, they can’t be adjusted independently other than via the Surround Audio setting.