Thanks Rob.
I have to say I am a bit disappointed to find that it is necessary to disconnect my laptop in order to get the best SQ from my DAVE. You said in an earlier post
http://www.head-fi.org/t/766517/chord-electronics-dave/1215#post_12220009 that "RF noise from the source can't get into DAVE". Now it turns out that it can. It is fiddly and irritating to have to disconnect my laptop, (the power cable is at the back) and easy to forget to reconnect it so it is dead the next morning. And although buying a Jitterbug is a partial solution it's not really very satisfactory to have to spend more money on a third-party product, which doesn't even totally sort the issue, not to mention that Audioquest recommend using two of them, so that's £80. After spending £8k on a DAC I was kinda hoping it would be unimprovable!
Do you think there are other possibly better solutions? For example, Intona have a full speed USB galvanic isolator, ifiAudio offer some USB cleaning products, or one could use a USB to s/pdif convertor and optical. I haven't got the money to try all possible solutions out, or the technical knowledge to make good judgements, but it would certainly be great to be able to play my hifi without having to fiddle with wires and always get the best possible sound quality.
'Scuse me moaning, but listening to music with a DAVE is such a wonderful, totally involving experience that I want to always get the most from it.