Belles 350a Reference, Classe 2200, Ayre V-5x,

We have no idea what your priorities are...Everything in audio is "give and take", and one piece will not fit everyone's needs. So tell us what you like and what's most important to you!

not enough info. above to render much useful feedback: I've experienced wonderful performance from an Ayre V3 (a junior to the V5) & have experienced absolutely horrible performance from the 350a.

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.

The Classe 2200 is winning "amplifier of the year" awards in France and Germany.