Bad buzz in my monitors

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fully

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I use an allen and heath GS3 console and im getting a really bad buzz coming out of the monitors. I had an electrician check the grounding of my studio and all is good. When i plug my monitors directly into my digi rack its fine but not in the console. Any suggestions?
 
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fully said:
I use an allen and heath GS3 console and im getting a really bad buzz coming out of the monitors. I had an electrician check the grounding of my studio and all is good. When i plug my monitors directly into my digi rack its fine but not in the console. Any suggestions?
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Well I am an electrical/electronics guru and maybe I can help. Does this rig have an internal pre amp(s) in it?
I assume by "buzz" you mean 60 Hertz AC noise correct? If this is the case which it most likely is then first try switching low level signal cables (in case shielding on some is bad) and or moving all signal cables away from any AC power lines (some rigs are just bad at AC noise elimination so power and signal line separation helps). Be sure you are powering both units off the same AC circuit (try switching AC power sources if possible). If that does not help and If you feel you have isolated the source of the noise to the GS3 console "only" then it gets more dicey. If the noise is actually coming from inside the console e.g. like a pre amp inside is bad/or noisy internal ground then it will take a little more home work to fix. It could be a range of possible issues, a. Bad or high resistance/impedance grounds (stuff gets loose) inside the console. b. one or several bad filtering capacitors inside the console (this is common especially for electrolytic caps to go bad after many years in a preamp power supply) or c. another bad component in the console. Its hard to say without a schematic and an oscilloscope to look at the signals and see where its coming from. but what I suggested above are the most common culprits. You could try isolating your grounds but this can be dangerous and I do not recommend it unless you are an electronics professional and know exactly what your doing (you could get shocked)! or worse. Not all grounds are created equal (even though an "electrician" tested them. The AC impedance of the earth ground is what really matters and most electricians have no clue what this means. also try turning off any dimmers or florescent or other "noise makers" in the area. I have had those noise rattles cause me trouble before too too often. Good Luck, and be careful if you open anything up to disconnect all power and not to touch any "hot" power lines.
p.s. can you answer me a question? I want to post amps and other stuff/guitars etc for sale here. How do I do that?
 
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