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In Reply to: RE: Ground loop posted by Pro Sound Guy on June 14, 2009 at 18:25:15
"Get yourself a 25 cent ground lift adaptor from the hardware store
Lift the ground on one of your input units or the power amp
Lift the ground on say your pre amp first...if the hum is not
gone then try the power amp as the last unit to lift the ground
on with the adaptor
Your system will still be grounded "
You should NEVER EVER lift the AC grounds!!!!!!!!! The system will NOT be grounded as the shield will not carry enough current should a problem occur.
He needs to find the REAL problem-NOT a dangerous band aid.
I suggest hooking up the balanced input to the amp as balanced and not hooking up the shiled wire.
On the preamp end hook the hot wire from the amp to the hot output of the preamp. Hook the cold wire and the shield to the ground of the preamp.
That will fix it most of the time-and he can take advantage of the commmon mode rejection of the amp balanced input.
There is not a Judge in this land who wants to hear how "the hum went away" when somebody has used a widowmaker ground lift to get rid of the noise!!!!
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