I think I've isolated the buzz as a ground loop issue, which is now very slight.
I can only hear this when I'm 1-2 feet from my tweeters. I could probably live with this.
I plugged everything back into the wall (beginning with the MC402 first). Off the wall my system sounds better.
I'm going to try to introduce the P10 again probably one last time, and see how it goes.
This is a component I really want to keep, but I won't force it if it's not meant to be.
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Main > Aurender N10/N100 / Antipodes K50 > Aries Cerat Kassandra mk2 - Playback Designs Dream DAC > D'agostino Momentum HD > PS Audio P10 > D'Agostino S250 > Sonus Faber Aida / REL S812 Six Pack + 4 JL Audio F113 Fathoms > B&W Signature HTM > Anthem Statement D2v > Mcintosh MC205 > Focal 1000 (side surrounds) > Bryston TIW (rear surrounds)
Secondary System > Aurender N100h> AMR777SE > D'agostino Momentum Integrated > Wilson Sasha DAW
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