I've heard B & K with Monitor Audio speakers, nothing wrong with that match.
I'd suspect other things. A bright room, a malfunctioning amp, etc. You've gone from 60 to 200 amps and to my ears, B & K is a little warner sounding
than Rotel -- the extra power may be bringing something out that clashes with the room or with your ears. You may also be playing the music louder
than usual, which could cause problems in the room that you didn't encounter with the weaker amp.
I'd suspect other things. A bright room, a malfunctioning amp, etc. You've gone from 60 to 200 amps and to my ears, B & K is a little warner sounding
than Rotel -- the extra power may be bringing something out that clashes with the room or with your ears. You may also be playing the music louder
than usual, which could cause problems in the room that you didn't encounter with the weaker amp.