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I want to connect a Sonos 5 to a legacy hifi amp which has a turntable and cd player connected to it. The cd player has an optical connection, not RCA. The speaker wire terminals on the amp are spring loaded not RCA. Is there a way of connecting this to the 5's 3.5mm input? 

Not easily.  The spring loaded connecters are amplified, not line-level connections.  You need line-level for the Line-In on the Sonos.  There are line-level converters, but it won’t be the most elegant solutions, and will still have the legacy volume control in play. 


What is the model number of your “hifi amp”?


For the turntable, why not get a phono preamp and connect the turntable to it and then it to the Five?

For the CD something like this, it is just the first one I found, not a recommendation.

https://www.amazon.com/PROZOR-Digital-Converter-Optical-Toslink/dp/B00KNNSKV0/ref=sr_1_3


Not easily.  The spring loaded connecters are amplified, not line-level connections.  You need line-level for the Line-In on the Sonos.  There are line-level converters, but it won’t be the most elegant solutions, and will still have the legacy volume control in play. 

Thanks,  I think i need to go back to the drawing board.