My wife likes to watch TV at a much lower volume than I do. Due to my hearing loss, I bought the Sonos Ace headphones so that I can watch TV at a higher volume with her while using the Sonos Arc Ultra.
Before purchasing Ace headphones, I asked my dealer this specific question. The tech responded positively saying that both the Ace and the Arc Ultra can simultaneously play the TV sound. After installing the Ace headphones, my dealer verified that Ace & Ultra Arc will not play sound at the same time. This is the main reason I bought the Sonos Ace headphones.
I also bought a Move 2 wireless speaker. The Move 2 has the ability to play simultaneously with any sound group (Port, Ultra Arc etc.). It would seem that the same simultaneous capability of the Move 2 could be applied to Ace Headphones as well.
Looking forward to a quick feature update from Sonos on this issue so I can begin using my Ace Headphones as intended.
Thank you!