Turntable and Headphones

Not sure why you’re not ‘swapping’ between your Beam (grouped with your playback choice) and the Ace. Once you’re playing on your Amp, just ‘group’ the Beam’s room, and then you should, I think, be able to use the ‘swap’ feature. I’ve never found a reason on my own to do this, but then my circumstances are likely different than ypurs. 

Wasn't  sure on the swap option so I tried the audio-swap while streaming music and it un-Grouped my Arc Ultra and powered on my TV. Sure wish that would work, my Ace would see a lot more use. I do use the TV's Amazon Music app to play and then swap but that is a silly amount of power to use co pared to p.aying Amazon on my Tablet's Amazon app and playing over Bluetooth. 

Only way I see to use the Ace for streaming within the Sonos system is with a Sonos Port and third-party Bluetooth transmitter.

Outside Sonos a Y cable from the turntables line-out and a Bluetooth transmitter would work

I don’t have the Sonos Ace headphones so I’m not able to try the “swap” described above. I appreciate the responses here. I was hoping to hear a definitive answer before spending the $ on headphones. It just seems odd that Sonos hasn’t made this simpler. 

There are a lot of questions here on why Sonos made several of the design decisions on the Ace. They are very nice headphones and Sonos is addressing some of the issues with updates.