Bel canto Ref600 versus PS Audio M700


Anyone here has experience with these two? How they compare?
benjosef1
Ditto. Considering both. Anybody? One is Ncore, the other is a proprietary “gain cell.” @benjosef1 and I are both interested in any direct comparisons. Thanks much....
Actually the PS Audio is Ice Power 700 ASC with a Gain Cell input circuit. I am also very interested in opinions, as I wish to get one of these two. Which will sound best with a passive preamplifier?
@koestner 

Quite correct; apologies. Do hope someone can make a comparison between the two amps.
Just giving this one more try. Really, these are about the two most popular Class D amps out there, no one has heard both. I have heard the Ref600 with Wilson Sasha's and thought they were excellent.