Sonos Port and Sony STR-DH590 Receiver

How are your Sonos speakers configured? If the Eras are surrounds to the Ray, the line-in is disabled. If not, the line-in to the Era is an input whilst your post suggests you’re trying to use it as an output?  Which speakers are not responding to volume changes? Your subject for this thread mentions a Port but you don’t mention it in your post/question. 
 

The volume of what? Sonos speakers or the ones hooked to the Sony?

I don’t have any speakers hooked to the receiver. I am using the 2 ERA100’s and the Sonos Ray in another room.

My setup is the Sony receiver with a Sonos Port. 2 ERA 100 speakers set up in stereo in the room with the receiver and the Ray in another room.

What is connected to the receiver besides PORT? Are you attempting to use AM/FM radio or phono from the SONY? Why do you want to use the SONY Volume control?

If there are no speakers on the receiver, why use it? Just stream the station you want to listen to on your Sonos speakers from MyTuner, TuneIn or other streaming services.

The receiver volume control changes the receiver volume, that would be the pre-out, if it has one, and the speakers hooked to the amplifier outputs.

Note; This receiver does not include a line level output or a Phono input. It can receive Bluetooth, but there is no easy way to transfer this to SONOS.

Thank you for all of the replies. 

My ultimate goal is to have the ability to stream music through the port/receiver, connect turntable and CD player along with having Sonos speakers in multiple rooms to hear what is playing.

I haven't tried to look up your device but the post above your last indicates there is no line-level output from your device to send to the Sonos Port.

You can confirm this yourself, but it is common on lower featured reciecers today.