Funny, I've been an AC member for a few years, but never posted before now.
Other associated equipment:
Pre is Aesthetix Calypso
Sources are:
Cambridge 840C CDP/DAC
Squeezebox Touch
Aesthetix Rhea phono stage
A few different TTs/Arms/cartridges
Cables are basic Van Damme studio balanced cable from pre to amps and Tannoy Ultralink solid core silver speaker cables (had them left when I sold my Tannoy supertweeters a while ago - nice and short). I run balanced from phono, CDP/DAC, and run standard phono cables and a coax from the TTs and SBT.
Impressions so far? Previous amp was a Behringer A500, which seemed ok, but I was obsessing about its input impedance as the Calypso's output impedance climbs quite a bit from its nominal 600 Ohms as the freq gets lower.
I find the bass seems better controlled with the NC400s, and detail isn't sacrificed at all (may even be better, but I'm a reluctant subjectivist). I have yet to put the Behringer back in the system, so untill I do that, it's unlikely that I'll be able to really assess the sonic benefits.
On the other hand, I now have the monoblocks I want, that fit inside the stands I'm using for the Quads, and they stay on all the time, which I didn't do with the Behringer, as I had a couple of startup transients that I didn't like.
Subjectively I think the NCores are better than the A500, but how much better is difficult. Many would probably balk at the price difference (and I got the A500 used for £80). But were all about diminishing returns. No?
In any case, I can't see these going anywhere soon.