-=> Quoting DONALD QUARLES to ALL <=-
 DQ> I have a mackie mixing board 16 channel being run in stereo and
 DQ> also a stereo graphic E.Q. and a processer and Bose in the
 DQ> ceiling speakers and a 1000 watt per channel power amp and also
 DQ> for the motiores i use a pevey head 300 watts per channel. what
 DQ> the problem is when i turn the thing up i get a low freg. hum and
 DQ> can not fiqure it out when no one is using the system is hum
 DQ> likes a boat motor off in a distance..
Sounds like a ground loop to me. Is everything plugged into the same
leg of AC power? Are you running long unbalanced lines? Are signal cables
(esp. unbalanced) running paralell to AC feeds? Tell me how things are
wired up, and I may have some ideas. Take care.
... HCI stands for Help Crime Increase!
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