JJPCHEERS wrote:
The 2 100’s are together in one group with the Arc. You can see them on each of the top book shelves in my pic
There’s two concepts here, Grouping and Bonding. Grouping is done as follows:
https://support.sonos.com/en-us/article/group-and-ungroup-rooms
It is dynamic, and each grouped room will play the same source. For TV sources, the grouped room will have a 75ms lag, causing an echo, which is why it is not recommended to group speakers with a TV source when they are in the same room.
Bonding is a semi-permanent link that allows each speaker to play a discrete channel. You can bond two like speakers as a pair to play in stereo, or you can bond two with a soundbar to be surrounds. Subs are also bonded to a speaker, speakers, or a soundbar surround system.
If you want a bonded surround system, your Era 100’s should be behind and to the sides of the main listening position. Then follow the instructions in my link above to add them as surrounds. If you do not want to use them as surrounds, I suggest you skip grouping them with the soundbar for TV sources, because the echo you are hearing cannot be eliminated, unless you want lip sync issues.