No, the Port wouldn’t connect to the speaker ports. The Port is looking for a line level signal, not an amplified signal. 

If I’m interpreting the picture correctly, there is no line level output on that device, and its signal can’t be sent to a Port without substantial difficulty (and essentially doing away with any speakers that device drives). I think you might be able to get data into that amp from the Sonos Port using those Aux inputs, but that device just doesn’t have enough/any line level output ports. 

Why bother with that device at all?

Bruce, thanks for your response.  It had been working before I moved it to another room.   Unfortunately I don’t remember how I had wired it.  It does have a 5 cd player as well; the record player works fine.  Ideally I would love to get it to work again...  

What is at the other end of your Aux cable?

The  CD player. I’ve tried various combinations.  (Input from Port to Aux; Output from Port to Aux; Input from Port to speakers etc.). 

I was able to get Sonos support help.  Thanks to Dante and his patience--he did an exceptional job figuring out the problems!  There were many issues:  First, the wiring was incorrect--I had to connect the RCA wires to the Port Input and then to the Stereo Aux ports.  The Port was also muted--it was showing a green light--I had to unmute (the light is then white).  When using the Sonos App, I had to select ‘Line-in’ and select Media Room (the name assigned to my Port).  It works and am very happy about it!!