Connect the turntable to the Line-In RCA connectors on the Connect.  Note: If your turntable has one, you need to turn on the phono preamp.  If it doesn’t have one, they are pretty inexpensive items to buy.  To listen to your turntable on the Denon, press the media player button.  Set the Line-In to Autoplay in the settings for the Connect.  This will automatically play the Line-In when you drop the needle.  You can also choose the Line-In source on any and all other Sonos devices, regardless of what is playing on the Connect. 

ETA: I just checked, that turntable requires an external preamp.  Like one of these:

https://www.amazon.com/Pyle-Phono-Turntable-Preamp-Preamplifier/dp/B00025742A/ref=sr_1_3?keywords=phono+preamp&qid=1663357709&sr=8-3

Thanks you so much! I’ll do it this afternoon… and I just so happen to have a preamp new in box that I’ve been storing for years. This is such great info! Truly appreciate it...

Actually.. one more question. So I do need the preamp. So now… what would be the wiring order?

Pull turntable out of AVR, and put into preamp, then to Connect? As much detail as possible would be great! I’m a novice… Thanks!

Turntable → Preamp → CONNECT’s Line-In

CONNECT’s Line-Out → any DENON analog input except Phono

Operationally, you would select the CONNECT’s Line-In and the DENON analog input.

You may run into a nag if the DENON introduces a sound processing delay. Often there is a “Direct” setting that reduces or eliminates this delay. Sometimes a “Direct” setting also eliminates the tone controls. This “nag” will be an issue only in locations where you can simultaneously hear a DENON and SONOS room.

Gotcha. Awesome. Thanks for the great detail. And I’ll listen for the nag and eliminate it if I need to.