hgeifman
I bought a pair of Bel Canto Ref 600Ms about five weeks ago, and so far I am very pleased. They are still breaking in, but I already find the sound very clean and clear with dead quiet background and nice, musical articulation of acoustic instruments. I find no harshness or edge to the sound--once the system is warmed up.
My front end is an Esoteric K-01 (mostly playing CDs) and an ARC LS25 Mk II; speakers are Focal Alto Utopia Be.
I suspect the tubed LS25 is contributing positively to the musicality and lack of edge. As someone once said,
"A good amp is like a sewer: What you get out of it depends on what you put into it."