The Sonos system is great, if you can work an Ipod you can work Sonos. as for the Dac, if your listening to compressed music/internet radio Tbh a good dac will show more flaws in it, if you have full bandwidth Wav's as the source then it would be worth trying. If you wanted to go for the HIFI from pc then you would have to be looking at a RME Digital sound card then use its digi output to the Quad. but no multi room
