After a few uses, my preliminary opinion is that the Sony pre is very good for acoustically based music, not so much for loud rock. It seems to lose cohesion when running -1 peaks for rock. I'd run lower levels to try and mitigate the "effect" but according to Doug, The Sony pre is true sub 16 bits, which is gonna be way worse running conservative levels. So Doug is warm modding two Marantz 620s. The specs blow the Sony away. And a little Oade warmth will be really welcome. Until switching from 4022s to dark side I'd run either an m148,
warm mod sbm1 or a 661 warm mod. Miss that sound, no disrespect to the Sony and nbox.