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I have a LG G3 tv and use Apple tv to controle the tv. The sonos system is also connected. So every time i start my Apple tv i have to choose which sonos source i would like to use for tv sound output. It normally chooses two sources - the speakers and the Sonos setup with arc, sub and era 300. I ghave to click out the tv speakers on the Apple TV every time. Please help me.

I don't know if you have changed any settings for the TV, but make sure they are set like this:

HDMI Input Audio Format: Bitstream
Digital Sound Output: Pass Through
eARC Support: On

Then set the Apple TV audio format settings to this:

Change Format: OFF
Dolby Atmos: ON

Sounds like you have done the remote setup, but it would not hurt to do it again.