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what are the chances of avoiding a ground loop if the amp and receiver are plugged into the same power strip? If that doesn't work, what about a cheater plug? Some people claim that there's really no problem with using one.
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Do you have a ground loop that is causing a problem?
With regard to cheater plugs, I have a standard speech I make that is part of the BFD Guide and goes like this:
"The cheater plug effectively eliminates the third prong on the AC plug. The 'third prong' is the electrical safety ground and is there to protect you and anyone who uses your equipment from electrocution. This safety ground is a cold conductor designed to provide a path to ground for safety protection against internal shorts inside your equipment when equipped with the three prong plug. The third prong connects back to your service panel (where it is bonded to the neutral wire), and from there is connected either or both to your house plumbing or external ground rod. On equipment with a third prong, the metal case and external metal parts are all connected to this safety ground when you plug the electrical cord into the wall. If a component fails inside a piece of equipment and the 120 volts shorts to the equipments case, then that case is now live and can electrocute you. If the safety ground was attached, then a breaker would trip to indicate you had a fault."
Use cheaters at your own risk.....
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Here's the Behringer: ULTRA-DI PRO DI800
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Yeah, that's a standard DI box (as they're called). The better quality ones don't add too much noise. You'd really have to test it out and see how it sounds to you first.
Why are you bent on a PRO amp? There are lots of regular amplifiers around that do a great job and don't cost too much. There's nothing special about a PRO amp other than it has balanced inputs and requires levels that a lot of regular receivers won't match...
brucek