My current set up is Arc Gen1, Sub Gen 2, and two Sonos Ones… I want the Arc Ultra but will it be compatible with the Sonos Ones and Gen 2 Sub? Thank you.
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Yes, the Ones and Sub (Gen2) are compatible with Arc Ultra
https://support.sonos.com/en-us/article/surround-sound-guidelines-and-limitations?product=arc-ultra
Super quick response. Thank you Mr T. 
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