"Connect speakers to amp (don't connect mixer), turn on amp and turn it up. Does it hum? If yes, it's your amp, if no, connect mixer, one channel at a time with all gain controls turned down. If it hums now it is likely a ground issue. If…"
Rule #1: Don't piss off the sound guy!
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Kenneth H. Williams said… © 2012 Created by Terry Lowe.