I"ve used the 350a with good success and the Ayre V5xe. I can't say which is best because each one had it own set of strengths and weaknesses. The Ayre is about a holographic midrange and superb smoothness and neutrality. The Belles has more slam and is better dynamically while offering up a very good soundstage. The Ayre is a little light in the bottom. The Belles sounds like it might be a little bit more extended top and bottom(close call)and sounds more powerful than the Ayre. Either is a good amp. Personal preference will dictate here but I'll defer to someone else.
I have not heard the Classe so I certainly can't comment. I do doubt if it would beat out either one of these from reports I have heard.
I have not heard the Classe so I certainly can't comment. I do doubt if it would beat out either one of these from reports I have heard.