How does Sonos port Share audio to other speakers and at what quality?

I am looking at getting either a Sonos port for my Hi-Fi set-up which includes a CD player and turntable. Once connected the audio from my HiFi will come out of my wired bookshelf speakers but will also be able to be shared via the port to my other sonos speakers over the wireless network. The question is, how is it sharing this audio and what is the quality of the audio being shared? As the source is CD quality can I expect the same from the other sonos speakers on the network?

Apologies in advance if this is in the wrong sub. Any help would be greatly appreciated

Thanks