I should also add that the only way to really figure it all out is to do it and work your way through because there are so many things that can get screwy. Things like new or old powerlines and transformers outside the house. In the air or in the ground. And what position you are in the immediate grid. For example if you are at the end, middle or first in the chain.
Trust me when I come here I debate in my thinking how far I should go into the process because there may be one guy who doesn’t believe the outside transformers make a difference as well as the entire pathway. And then you have the next guy who wants the inner wall studs voiced, that the wire will be running through (I’m doing a house like that right now).
The electrical transformer, panel, line and amp are all really one component. That component is then put inside of a house with electrical wires surrounding the system (fields). The house is one big electrical component, really cool stuff when you think about it. And it explains why the exact same component will sound different in each electrical environment. And that's besides acoustical and mechanical. I love this stuff. To me it’s a great big active physical puzzle that we get to play with.
Michael Green

