I use to own the M20s. They certainly can take whatever you give them, however, I ran them with a YBA Integre. 50 of the best SS watts out there. They sounded (the speakers, for my taste, do best with a sub and killer stands. the Revel stands are poor and will have more of a deleterious affect on the music rather than the positive affect excellent stands will provide--sorry for this long paranthetical digression) wonderful, but my listening tastes, loudness levels, room size, were conducive to the 50 watts. They do best (hey, what doesn't) with great electronics.
Integrated For Revel M20s
I just purchased a pair of Revel M20's on this site for a second system. Any recommendations on an integrated for them? I'm thinking possibly Plinius 9200 or Musical Fidelity 380, but have not ruled out lower powered options like Pathos Classis 1 mk2 or Unison Unico. Any feedback would be appreciated