Connecting Stereo Receiver to play radio, turntable, CD player on Sonos Speakers.

You say you’re using a co-ax input connected to a co-ax input. You need to use an output from one device to an input on the other. Try the line-in zone 2 output on the Onkyo to the Port line-in. 

I misspoke. The digital out on the port is connected to the digital in on the receiver.

The line in on the port is connected to the zone 2 out on the receiver.

I don’t have a Port but I assume you can (a) group the Port and the Eras, or (b) select the Port line-in (Aux?) as the play source for the Eras. Have you done that? Are you playing something on the Onkyo to have something to hear it in the Sonos system? What volume level are you outputting from the Onkyo to the Port? 

(The “Works with Sonos” on this Onkyo device is for a Sonos system to be a source into the Onkyo, as I understand it.)

Does the turntable have a built-in preamplifier?

No, if I only had the turntable, I would get a dedicated amp for it, but I also want to use the CD player and Radio with the Sonos. 

I used to be able to do it with my old Denon that was very simple, but the new Onkyo has so many settings. I wonder if I’m just not getting it right.  Maybe I don’t use the Digital Coax, and I just switch to an RCA cable? 

You could. What does the Onkyo manual say? Does it not mention Sonos?

Thank you. I’ll get another RCA cable and try that.  I’ll update in a few days after I try it.

Yes, use the Zone 2 output on the Onkyo to the line-in on the Port. But, curiously, you already have that connected according to an earlier post. 
 

You’ve not yet replied to my previous questions/suggestions. As well as making the physical connections, the Sonos devices need to be told what to play using the Sonos app. 

I tried Radio and Turntable playing. Line in is selected on the app. The volume level varies from 33 to 99.

When I connect the turntable directly to the port I can hear it playing, but it’s not amplified. so the highest sonos volume is like listening to music on 5.

This is a symptom of having the phono output on the turntable connected to the line-in input on the Port.  You need to switch the turntable pre-amp (which can be internal or external) to Line output. 

Is Zone 2 an independent zone, needing its source to be selected on the Onkyo device, or does it repeat what’s playing through the main speakers? If the former, have you selected your source to play? 

I’m not familiar with this receiver. Some receivers have an option for zone 2 to follow zone 1 input selection.

Many receivers don’t allow an data  from a digital input (like an optical port, or an HDMI port) to be carried by a zone 2 output (usually analog) , so make sure your test is from an analog (usually RCA) input. 

It was infact switching the digital coax to RCA.

I appreciate all the tips. Thank you.

Most of us have been there — that’s how we knew about that little RCA trick. 😁