I'm a member over here-
http://srforums.prosoundweb.com/index.php/f/6/0 Give it a try. There used to be some other knowledgeable pros there like myself but it seems they all disappeared when the board switched to this new format.
My advice still stands though. It sounds like there are multiple problems and it's going to take someone with sound system experience actually at the site to troubleshoot it. I know that you have gone that route before but whoever it was was not knowledgeable enough. A competent sound system technician should be able to determine if there are power problems and recommend a solution if they exist. This really is not the domain of an electrician because there can be many areas involved here, not just electrical. It sounds like the "engineer" is just passing the buck to coverup for his inability. Again, he should be the one to find the problem and if it involves an electrical issue elicit you to carry out his recommendations. If he can't do that I suggest turning to other sound installation companies.
-Hal
