A few things here. First, Sonos doesn’t make in-ceiling speakers. They do sell Sonance speakers through a marketing partnership. How certain are you about the provenance of these speakers? What makes you think they are Sonos? How have they been ‘driven’ in the past? Are there exposed speaker wires that you intend to connect to your Denon? 

Oh, and please don’t apologize for asking questions. If you don’t, you’ll never know ;)

You should be able to, through the Sonos CONNECT (it’s not a CONNECT:AMP, is it?) be able to play Sonos streams in sync across both Sonos and the speakers connected to your Denon. What you won’t be able to do is play things from your Denon(turntable, tape decks, etc) in sync across these speakers and any Sonos speakers.

For what it’s worth, if it is indeed a CONNECT, it hooks up in the same way as a old cassette deck, to a ‘tape loop’, with the audio out on the Denon connecting to the Audi in on the Sonos, and of course the other way.

I have not looked at the back of this Denon, it does have a tape loop to connect to?

Just looked at the back image of this device on Amazon…it does not have a tape loop to connect to. In fact, the only inputs I see are HDMI inputs. While you can likely drive your in-ceiling speakers, I don’t see an easy way to connect Sonos to it at all. 

Thanks for the reply and all the info! Yes, they are the Sonance manufactured speakers which were previously driven by a Sonos Connect Amp. The prior owner had numerous Sonos products, most of which he left for us. Unfortunately he took the Connect Amp with him. 

We would very rarely use the outdoor patio in ceilings, but with a bday party coming up I thought about using the old Denon amp and old Sonos Connect to try and drive them and connect to the rest of the Sonos speakers throughout the house. 

Bummer there isn't an easy way to do that, but thank you again for all the info! I guess I need to spend a bit to get the Connect Amp for the party.

Thanks again, have a great night.

I’d recommend the Sonos Amp, which replaced the CONNECT:AMP. It is slightly better in all sorts of ways. 

If this is your receiver, there are analog inputs that will accept a SONOS CONNECT’s Line-Out.

 I’m not sure I made it as clear as possible, but this receiver is not designed to connect to any Sonos device as a player. You can connect a Sonos input in any of several places, but there is no output appropriate to feed a Sonos device that can connect to other Sonos speakers. 

Well apparently I also suffer forgetfulness.  I dug out the spare receiver and realized I tossed the Denon 2200 when we moved cross country. But instead brought a Yamaha RX-V2085 instead. 

Sorry for the headache and bad info. Any help on THIS setup would me much appreciated! Thanks, and sorry again

CONNECT’s Line-Out can be connected to any set of RCA audio inputs except PHONO. While it may not be a lot of fun operationally, you could connect Zone2 or Zone3 receiver output to CONNECT’s Line-In.

You will need to work out a scheme to resolve the Volume control war. Both CONNECT and the receiver have Volume controls. You could set CONNECT for fixed output, but you would then be required to control Volume exclusivity with the receiver Volume control. If both controls are active, you’ll want to ‘set and forget’ the receiver’s Volume control.

Thank you for the detailed information! It doesn't seem ideal, but can get me by. I'll give it a try and see if the potential headache is bearable or not.

Thank you again!

You might try hooking the INPUT of the Connect to one of the Zone Out connections or the Pre-Out.

Typically, zone out connections don’t carry any digital inputs, so there is a potential for disappointment opting for that route. And note that all of these seem to be ‘assignable’, which suggests some programming of the receiver may need to be done. 

Agreed, but if you can get them to work the Zone outs are often more flexible than the Pre out which is why I suggested trying them first.