Old amp to Port to ERA300

Not sure exactly how you have connected the Port to the amp (please provide details if necessary).  But you should try grouping the Era 300 and the Port.

You might be able to connect the amp to the Era 300 with the Sonos adapter.  I am not sure you need the Port.  Depends what you are trying to do.

Edit: btw, welcome to the Community and to Sonos!

Are you playing the amp through any other (passive) speakers?  If the aim is just to take the audio output from the amp to the Era 300 then the Port is probably redundant.

​@John B 

I believe the Port is connected to an AV stereo amp via RCA out from the amp to which the OP has a CD player connected. The end game is to listen to CD’s over the Era 300. 🤔

I’m not sure what you mean by “amp”. Is this the SONOS product named “AMP” or a generic 3rd party ‘amplifier’?

Thanks for all these very rapid replies!

More details: 

The amp is an old Harmon karden amplifier getting input from cd player. 

Have connected output of amplifier to input of Port.

What am I missing? 

Thanks again! 

Just group the Era 300 to the Port when playing CD’s. If speakers are connected to the HK you may have an echo effect if the HK is in the same room as the Era 300.

Thanks! This must be a dumb question but how do I group?

I can see Port and speaker in sonos app...

Not that all 😊. Start CD music on the Amp with Port. On the Era 300 press the Play/Pause icon for a few seconds until you hear audio.

You can also set the Era 300 as the “Auto Play” room within the app as an option for the Port under Line-in (within its room).

Sorry again...don't see play/pause. 

In the Den where the Port is, it says no music queue even though music is coming through hard wired speakers. 

Play/Pause is located on the speaker itself below the volume slider between the left/right arrows. They aren’t words just symbols.