Until just a few minutes ago I had reservations about taking the system to the show. Buzzing right channel and audible hum on both including that nasty 60 cycle surging thing. 103db Pi's strip you naked in front of your peers.Oh the ridicule! I had put the snubber on the High Voltage section and replaced unshielded Silver Lace I.C.'s with shielded one's from our friend Kevin Haskins (DIYCable.com). Better. Tonight I shunted the dual mono attenuators and while I was in there re-heated some connections on the ground plane. Quiet and oh so clean! Pi's never sounded better. Now I can hold my head up in Gotham City.