Larry did a great job of describing this topic. For more in-depth reading there is a book by Philip Giddings titled "Audio Systems Design and Installation". You can also read some of his articles here:
http://www.engineeringharmonics.com/papers/papers.htmlAnother good source of info on this subject are the Rane technical papers, particularly under the "Wiring, Interconnection & Grounding" section:
http://www.rane.com/library.htmlAnd, lastly but definitely not least, is the information presented by Bill Whitlock on the Jensen Transformers website:
http://www.jensentransformers.com/apps_wp.htmlI've attended a few of his seminars on shielding and grounding and have always come away with some more insight into this vast topic.
One last thing. Get rid of all MOV's in your system. These can cause many different problems. The only effective surge protection made is by Surgex or Zerosurge. I particularly like the Surgex products and use them exclusively in my stage and studio setups:
http://www.surgex.com/Ivan