Interesting that the OP found the 50W Cayin A100T had enough juice to drive the KEF 201/2. I have had a pair for about two months and found it a difficult load to drive. They like power and high current, with lots of reserve to maximize dynamics. When I switched to Pass X250.5, the 201/2s snapped to life. The 201/2 puts out a very clean and hall forward presentation. Bass, however, is not a standout feature of the 201/2, and I use them with a sub (but then, IMHO, all monitors need a sub). I am currently A/B'ing the Linn Akurate 212 (a super monitor that plays huge and musical) and the KEFs. I still can't quite get used to KEF''s uni-q tweeter -- its not that I don't like it, I do, but at times (i.e., with some recordings) it gets a bit hard/fatiguing. That said, I'm liking the speaker overall.