I have a sonos system on delivery and will be testing shortly I will give you an update on the DAC. I am very pleased with the cd playback it has a very smooth yet detailed sound. I have also used the cd player in my last system with a Vincent Audio Sp-331 amplifier, Revel F-32 Performa speakers and Parasound New Classic 2100 preamp. It also performed well in that system and, as you see the Cambridge cd player is the only component that I held on to. I also have owned the Cambridge Audio 640v2 cd player. Great value but is no comparison to the 840c.