bump, I went with A C49 and pair of Mc611's about a month ago to drive a pair of Kef Blades I bought 2-3 years ago. The previous amp had 525 watts into 4 ohms and over 2k into 1 ohm, so stable and powerful enough I thought. What impresses me so much about the Mac gear is how dynamic everything sounds at low volumes. Contrast, soundstage, and pinpoint imaging all improved beyond any expectation because I never imagined how much audible difference a single watt could make.
My previous listening sessions would be in the mid 90's with +100db peaks and I still can, but I don't need to when I can get the music's full measure at idle. IDK if Mac pairs this well with all speaker brands, but I have no reason to shop further.