Looking at doing a multiroom Sonos system with an AVR in the Fam Room and some Amps around the house. Client want to hear Fam Rooms TV's audio everywhere when needed for a game, etc.
I want to do it and not have audio delays that will make it sound unbearable. What is the best way to achieve this?
I thought to use the analog output of zone 2 or 3 on the ES AVR and feed it into the Port. Not sure if this would work or not.

Potential set up:
Fam Room- Sonos Port with a Sony ES 3100 or 5000 AVR

Den- Sonos Amp via HDMI arc for two in walls

MBR- Sonos Amp via HDMI arc for two in walls

Kitchen- Sonos Amp

Outdoor- Sonos Port connected to multi channel amp

I don't know if this will help, but a recent job I worked on had a Marantz AVR powering a family room surround system and it's zone 2 output fed a pair of speakers in the kitchen. The TV audio from the Marantz zone 2 would hit the kitchen before the family room causing an echo effect. The timing difference was pretty significant.

I used one of these to even it out. I had to adjust it to about 100 ms I believe, but it matched really nicely.

https://www.amazon.com/Sescom-V-SYNC-Lip-Sync-Corrector-Sescom/dp/B00C0NTHOU/ref=sr_1_2?keywords=audio+lip+sync&qid=1583325664&sr=8-2

In theory, if you set the Sonos input to uncompressed, it should have a delay of about 75 ms, so you could use that lip sync piece to add additional delay if necessary.

Unless you need exact lip sync with video in the remote rooms, Group all of the SONOS players. All members of the group will be time aligned with each other, but there will be about 75ms latency between the Line-In and output from the Group.

If you use the HDMI input on AMP and configure it as a surround room, you can use the AMP's lip sync adjustment to align the Group'd rooms audio with AMP's output -- at the possible detriment of lip sync with the video.

In the Fam Room use audio from PORT, rather than direct audio from the receiver. This will result in time alignment, but may not be the best lip sync.

Note that there can be miscellaneous delays in A/V receivers that will frustrate this sort of project. Sometimes "direct" processing in the A/V will eliminate the delay.

considered HEOS? the denon/marantz recievers have it built in.

Need Apple Music....

Can you use 2 Sonos Amps instead of the AVR?

This really is when you want to consider Sonos amp and Maybe HDMI selector for TV. These days it's probably one HDMI source to TV anyway. And customers won't really miss the difference between real surround and having four speaker going at the same time. They'll just think the surround is working really well and won't ask you why the surrounds never work.

I want to give them a good (real) surround system, not the Sonos "surround system". There's got to be way to accomplish this.

You’ll only have issues with the Sonos latency if there is audio coverage overlap of Sonos rooms and the main room.

This will muck with lip sync a little, but skew the room size defined in the A/V unit. Don’t install the rear surround speakers, use side surround instead, but define the rear surround speakers as being distant. Define the front speakers as being close to the listener. The receiver will need to delay the front speakers to match the fictional distant rear surrounds. This will bring the main room time alignment closer to the Sonos Group. (You’ll need to fuss with this to work out a reasonable compromise.)

Depending on your point of view this is not as bad or it is worse than you think. Even if the rooms are time aligned, and all rooms in a Sonos Group will be aligned within 2ms, a more distant room will seem late to an observer in the near room. An observer in the distant room will claim the opposite. Anyone who has done sound reinforcement in a large venue has struggled with the collision between direct and amplified sound.

In a home situation where audio coverage overlap is less likely, lip sync with displays in the remote rooms will be the biggest issue.

A while ago I did a 4x4 matrix install (2 cable boxes, Blu-ray & AppleTV).
There was 4 video zones but 8 audio zones. I fed each cable box, AppleTV & bluray into four different Sonos connects via analog. Then programmed the control system to have an option for the ceiling speakers to play the tv audio. With IP control it worked out very well as far as programming went plus no delays.

Can you get the main TV HDMI ARC back to one of the Sonos Amps (den, bed, kit)?

Then turn off TV autoplay under Home Theater settings