Depends SOLEY on the speaker involved. On my Thiels, PASS power amps without question...no doubt about it. On my BIG Magnepan 20.7's so far Aesthetix Atlas but would love to try a few others. Also in the past, Bel Canto's E.One series amps have been great on Thiels as well. Would love to try some tubes on my Magnepans...thinking about Carver's new tube amps or maybe going ARC.
