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Equipment: Sonos Arc, Sonos Sub, 2x Era 300’s, Roku Ultra, LG TV. 

Connections: Roku Ultra to LG TV; HDMI Arc from LG TV to Sonos Arc Soundbar. 

All 4 Sonos speakers are working together when playing music thru Sonos via Sonos S2. 

With TV running, sound is coming thru the Sonos Arc. I am able to control volume and play/pause of the whole system from the Sonos Era’s. But no sound is coming from the sub or the Era’s.

When playing music thru Sonos all is happily working. 
 

The Roku is new. When I was using an Apple TV Gen 1, all was working together. 

Make sure the TV is set to these settings (if available);

HDMI Input Audio Format: Bitstream

Digital Sound Output: Pass Through

eARC Support: On

 

On the Roku Ultra, set the Preferred Streaming Format setting to Dolby and the Digital Output Format setting to Passthrough.

Then find a 5.1 or Dolby Atmos source to test the speakers.

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