You might be surprised to find out that all that humming, buzzing & noise coming out of your PA & monitor system is being caused by poorly designed gear! In many cases, there isn't anything you can do besides replace the offending gear with well designed gear.
Links
Jim Brown's paper part 1
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Jim Brown's paper part 2
Jim Brown's paper on SCIN - part 1
Jim Brown's paper on SCIN - part 2
Rane's page on the Pin 1 Problem
Jensen paper on How to build a "Hummer" to test for a Pin 1 Problem
Jensen paper on proper grounding
Peavey article on Pin 1
Article by Philip Giddings
Audio Systems Group PDF on the Pin 1 problem & HAM radio
Tony Waldron's (of CADAC) article on EMC - part 1
Tony Waldron's (of CADAC) article on EMC - part 2
Tony Waldron's (of CADAC) & Keith Armstrong's article on correct shield bonding
Rane's version of Jim Brown's paper in a different format
Henry Ott's technical articles on EMC,EMI, proper grounding, etc...
Henry Ott's tech tips on EMC,EMI, proper grounding, etc...