Rythmik sent me a select amp that definitely is quiet when the "surge" is gone. However the transformers still buzz when I get the "dc offset". I purchased a Emotiva cmx2 that has fixed the problem!! They have gone an entire day with no buzzing of any kind. I am grateful that Emotiva produced this item but wished they would have made it out of plastic to cut the cost..
I also called Rocky Mtn. Power and they basically told me there is no such thing as DC offset in the AC system. Even though I have taken DC readings of .34 Vdc when the buzzing occurred. I was basically just laughed at and told it wasn't their problem. Nice