TruePlay for TV only

“but not for Music: most notable there’s a delay between the TV and surrounds, makes the music sound live instead of crisp.”

How exactly are you streaming music to the Beam setup? Is it through an app on the TV or a connected TV streaming device?

Music source is always Apple Music via AirPlay (iOS).  But keep in mind the delay is only there with TruePlay on, so doesn’t seem like it’s related to the streaming source unless I’m missing something.  There's other audible differences with TruePlay on, seemingly EQ related (more bass etc).  I’ve not dug into more but I imagine the delay is likely there  purposefully (for both TV/Music), likely the front (bream) firing later than the back (surrounds) to compensate for the back being so much further to reach the sofa as the tuned sweet spot, but I’m guessing here.  

If you are using AirPlay to stream Apple Music from your iPhone to the Beam and the Music Playback setting in the Sonos app is set to Full, there should be zero delay from the surround speakers with or without Trueplay enabled.

My understanding was that Surround Distance settings are effectively the delay/timing.  And that if you do tune via TruePlay it affects that as well as EQ, but you can further tweak both, so I’m no surprised that the delay/timing is affected.  But that would be counter to what you’re saying.  Why wouldn’t Trueplay affect timing/delay of the front & surround given it would optimize based on the mic location of my iPhone where it was tuned in the room in the initial position when calibrating?

As a point of reference both Left and Right are set to More than 10 feet (3m) in my settings for the Surround Distance.

This Sonos Staff answer does say TruePlay affects timing (just not balance).  So again, not surprised that it does, just looking for a way to only do that for TV.  

The Surround Distance setting only affects the volume of the surround speakers, not the delay/timing.

From the Sonos website regarding Surround Distance:

Use this to tell Sonos how far away your surround speakers are from your main listening position. Changing the surround distance will adjust the overall volume of TV and Music playback on the surround speakers.

How large is your room? What is the distance between the Beam and the surround speakers?

You will have a delay in sound to the rear speakers if you’ve got them set as another room, and grouped them to the room with the Beam. I just say this for clarification, to be sure you have them set as surrounds?
Surround distance, AIUI, is how far (wide) to the left and right surround speakers are located from the listening position. And you can only set these if Trueplay is disabled. 
 

With the new app, you can actually adjust these settings WITH Trueplay enabled now.

Oops! I wonder what else I’ve not discovered and I’m missing out on! 

The Surround Distance setting only affects the volume of the surround speakers, not the delay/timing.

Good catch - my bad assumption there.  Looks like Surround Distance AND Music Level and TV Level only affect volume.  Nonetheless, from staff answer seems like TruePlay does affect timing.  That would actually make more sense then that the delay is there for TruePlay.

How large is your room? What is the distance between the Beam and the surround speakers?

Roughly 25’x35’?  So > 35ft between the Beam and surrounds.  

You will have a delay in sound to the rear speakers if you’ve got them set as another room, and grouped them to the room with the Beam. I just say this for clarification, to be sure you have them set as surrounds?

No other room involved, Beam, Era 100s and Sub mini all bonded to 1 room, and yes the Era 100s are set as surrounds.