Oh wow, the 5i mk2, nait xs with the b&w cm5's really rock, although at first I thought the amp was going to give me a beating, having to use the good old QED silver anniversary at first (as I didn't have an else at hand)boy it was very forward, brutal even, and thought I had made a big mistake of replacing my trusty arcams . But after reading around some forums, it seems naim amps are a bit fussy about cable so found some cheap(ish) linn k20 on a well known site. Which I read works well with the naim gear (same as nac a4)until I can afford some nac a5. And what a difference it has made. It has tamed the beast and now has that excellent rhythm and timing that I've read so much about. The amp only has around half the power of the combined arcam a85/p85 duo but you'd think it was the naim who was packing all those watts, I was also a bit worried that the one box couldn't match a mid price two box combo for digging out the lower bass and taming the higher trebles but the xs matches them and more, it just sounds so much more composed. Probably might not even bother with the nac a5 now at £150 for the length I need ,My holy grail (at the moment) has been found, now how much is one of those flatcaps? Lol.