Connect the turntable and Beoplay to what? When I look at https://icecat.biz/en-my/p/bang+-+olufsen/1200235/loudspeakers-5705260049916-beoplay+a9+mkii-30230565.html the Beoplay does not do line out?

If you’d buy a Sonos Port you could connect your turntable to the Line in on the Port (the Port needs a line level connection, so a preamp, either built in or extraneous is needed) and the Beoplay could be connected to the Line out on the Port. This way you can play the music from your your turntable on your Sonos system and your Beoplay. Since the Beoplay does not seem to have a line out, you cannot use that as a source for Sonos.

Hello and thank you very much for your swift response. 

The way you have described the solution is actually exactly what I was hoping to get confirmed (I guess my initial message needed more details). 

So thank you for confirming I can add my turntable (which has a built in preamp) to the Line-in on the port and additionally my Beoplay to the Line-out on the port. 

Much appreciated!

Kind regards,
Manuel

You're welcome. Just check your Beoplay does really have a Line in in.

This I can confirm (to anyone else who might need this information). Currently I have connected my turntable to the line-in on my A9.