01-30-15: Georgelofi
Many far more technical than me say none yet can be called true hiend, as technology is not yet developed to allow the switching frequency of Class D to be high enough which then has to be filtered out at the end, and that filter not to have an audible/measureable effect on the upper mids/highs of the audio spectrum.
Interesting! I heard some has replaced their BIG BIG $$ amps with Mola Mola Kalugas and the Hypex Ncore NC1200 is a major break through in Class D.
I'm running all tubes and in the market for a SS amp to use in the hot humid summer months and can't believe I'm going to say this, including some Class D amps.