I need detailed guidance how to connect Sonos Port to Beoplay A9 4th gen so that it can play along in sync with the Sonos system of speakers I have (Era 300, Arc). So far I was able to connect the Port to the Sonos system and connected the Port to the B&O A9 using an RCA to 3.5 mm cable (A9 has only 3.5 mm in). No sound whatsoever coming out of A9. I used the line out ports of the Port to plug the RCA. I am doing something wrong apparently as for now only the Sonos speakers are playing the online radio stations, not the A9. Guidance needed
