If copyright rules allow it in your country, use a tool to create lossless copies of your collection. Store them on an NAS or on computer hard disc, and then access them as a music library. That way, different speakers/rooms can play different tracks from your library. 

Subscribe to Apple Music for CD quality streaming of 100 million tracks and save yourself the hassle.

All CD playback produces an analog signal. We humans can only hear analog, so a digital signal must always be converted via DAC to analog.  

Thanks Rhonny  I’ve got the subscription. The thing is I wanted to use my old cd library . King of nostalgic thing 

Ignore the Spam post above (it will soon be disappearing).  FIrst of all, it’s Spam.  Second, the information it gives does not apply to Sonos.  Except for TV soundbars, Sonos has no way of inputting a digital signal, it only has analog Line-In.

Fair enough. You won’t hear any difference but I’m sure it will ‘feel’ different!