I have the revel Salon 2 and have used Krell 350 MCX, 450mcx and Ayre M-XR.
The MXR has very smooth mid and highs but does not have good on control of low end like the 450MCX. Between these two amps, I preferred the 450.
I am currently using a Krell Evolution 403E for music and HT along with a couple of S275 amps for surround speakers. The Evolution E series still has the Krell sound - deep bass and dynamic but it's more refined with smoother mids and highs.
I also use Audio Research REF 250 monoblocks for 2 channel music. It does not have the low end of a Krell but the imaging and vocals are beautiful.
I don't have any experience with Classe or McIntosh.
Rich
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