Just hook up a digital coax cable from the Sonos to the Nova and you have a music server that works well and sounds unbelieveable. The Squeezebox, Apple TV, Apple Airport all work the same way with the same results.
If you have an iTouch or iPhone...
You can get a remarkable device from Apple call the Airport Express fro about $100. It lets you transfer music you have stored on your computer in iTunes to anyplace you choose. Simply plug it in to the AC behind your system and run an optical cable to the Nova.
If you already own an iPhone or iTouch, you can download a free remote app on your iPhone or ITouch and control all the music on your computer.
With the right setup, these are the same 1's and 0's you get from your CD player so sound quality is never compromised and can actually still sound as good or better than your CD player.
Home Theater Bypass...
Finally a way to get the best two channel performance with my Home Theater The 3rd analog input of the Nova doubles as a "Home Theater Bypass" so you can have the best of Home Theater and 2-channel in the same system. Simply take the left and right "pre out" from your receiver or processor and connect to the "Home Theater" bypass on the Nova. A selector switch on the back panel converts from Aux to HT bypass. In this application your receiver transparently uses the L&R amplifier section of the Nova, leaving the HT receiver amplifier to push only the center and rear speakers. One, this leaves the receiver responsible only for pushing only the center and rear speakers, making the receiver much more efficient and less taxed. And two, when you listen to a 2 channel source plugged directly into the Nova, there's a straight line from the source to the Nova to the speakers...no processing, no running the signal through a forest of circuitry. This leaves little between the music and your ears. If you're a 2 channel fan, it's the only way to do a theater right.
If you need more power to the front speakers than the Nova offers, you can use a more powerful outboard amp via the class A output stage.