-=> Quoting DONALD QUARLES to T OWEN <=-
 DQ> well thank you first for replying to me. This is in our church
 DQ> we have had this hum since i have been there we havbe a 100'
 DQ> snake runnign from the back of the building to the stage on the
 DQ> stage we have 16 plugs all sheilded and grounded the snake is ran
 DQ> through the ceiling in a plasitic pipe. then as they come to the
 DQ> back they go into the sound room and hook up to the XLR plugs on
 DQ> the mackie now for the monitors we have a cable coax running
 DQ> about 65 foot coming from the stage which has two peveay's
 DQ> montiors and then through the 65 foot line and into the peavey
 DQ> montior head. and in the sound romm we have a E.Q, Power bass
 DQ> amp. and effects machine for speakers they have insatlled the
 DQ> bose with the sub woofer system.. that is it in the nut shell and
 DQ> kind of help would be apperacited.
Aha! Peavey! I am tempted to say that the trouble is the Peavey stuff,
but that is too obvious, so.. I still think that it must be a ground 
loop. Have you tried cutting the shields on the female end of the XLRs?
That might just do it, although it would be a pain if it doesn't fix the
problem. You could try unplugging each XLR until the hum stops; that 
would be the first thing I would try. It is important to make sure that
all of the AC power is on the same leg of the service also. An easy way
to troubleshoot ground loops is to use an AC ground lift on different
pieces of gear, and see if the hum goes away; this is only for trouble
shooting, because it is dangerous to run things that way, but if you 
find that the hum stops, then you would be a step further toward fixing
the problem, and could use a 1:1 transformer on the peice of gear that
was the culprit. That's all I can think of right now, but if I think of
anything else, I will let you know. Take care.
... Elvis is dead and I don't feel so good myself.
--- Blue Wave/DOS v2.30
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