OK, so here the set up (after following some sound advice) - 272, 250DR, XPS (DR) with Powerline and driving a set of Focal Diablo Utopia III (on loan). I'm still waiting for delivery of the rack, so its sitting on the old glass shelves.
The sound is simply stunning and the improvement since adding the XPS this week is huge. However, I get a hum from the XPS - Definitely not through the speakers.
Pinged off a quick email to Naim who tell me and I quote, "it is quite normal to get a physical hum from any of our “big transformer” devices if the mains supply to it isn’t clean". There are pages and pages of comments on this topic and from what I've seen, very little agreement on how to resolve it.
I do have an IsoTeK somewhere but I was told to dump it when I first got "infected" with the Naim Virus!
So, any thoughts?