I have a suggestion for great balanced sound when listening to music and it would be helpful when listening to TV as well. I normally sit on a sofa along the back wall facing the Arc Ultra on the front wall, with two Era 300’s just behind the sofa along the left and right walls, and two subwoofers behind each sofa arranged in an L pattern. I prefer to sit on either end of the sofa with the armrest which is closest to one of the surround speakers.
The surround audio tv and music levels are set to -15 to try to get sound away from the surrounds and towards the Arc. All I cannot hear is music from either the left or right Era 300, which overpowers the Arc Ultra. I hear nothing from the Arc Ultra unless I get up and walk towards the front of the room.
The solution would be to put a graphic joystick in the Sonos app, which would allow you to balance the sound anywhere in the room relative to where you are sitting. If you want to see what that looks like, test drive a Tesla and go to audio settings under balance.
