connecting a turntable

You’ll need a Sonos speaker with a Line in or a turntable with Bluetooth. 

If using a bt turntable, you will also need an additional Sonos speaker that supports bt. Then you can group that speakers room with Beams room. Sonos Beam itself unfortunately doesn’t support bt audio. 

Good place to get started

https://support.sonos.com/en-us/article/listen-to-your-turntable-on-sonos

One important note, if you do the line-in method, I believe you need a Sonos-made cable for that as others won’t work.

Only true for the Era 100/300, and only in the case of the adapter.  For the actual cable, any RCA to RCA (Port/Amp) or RCA to 3.5 mm stereo (Five, Era) will work just fine.  

Did you get your turntable connected?  I have the same turntable, bought the Sonos line-in adapter and an rca to 3.5mm cable but can’t work out a way to connect them to the turntable so any info would be welcomed.

Have you set the turntable to Line out? Then plug a cable to the line-out (is that a different connector than the rca?), the other end to the socket of the Sonos adaptor, the other end of which goes to the USB port on the Era.

Line connectors are usually 3.5mm jack connectors rather than RCA’s. 

​@RoseDew 

First of all as ​@nik9669a said the switch on the turntables back has to be set to „line“. 
I saw different pictures of your turntable model on the net, the older ones have a cable one end directly connected to the turntable and the other with RCA 2 Cinch connectors (left and right). The newer ones have a separate cable also with RCA and 3,5 mm Stereo at the other end that can be plugged into a 3,5 mm connector at the turntable. 
So for the older model you will need a RCA female to 3,5 mm Stereo male cable that connects the turntable cable with the Sonos adapter. 
For the newer model with a connector you can directly use a 3,5 mm male to 3,5 mm male stereo cable to connect the turntable with the Sonos adapter. 

Note that Line-In is disabled when a SONOS speaker is used as a surround speaker.