If you don't mind extrapolating, 603 S2 Anniversaries being driven by this piece (review on crutchfield). It's now superceded by the SU-G700M2 with some trickle down tech from the reference 1000 model, they upped the switching freq from 100khz to 400khz and now use gan fets in the power supply. I would purchase with a 30 day return but my current amp has made me stop looking.
