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Static in the System

Discussion in 'Recording' started by Groovemonster911, Jan 31, 2008.

  1. OK. Well I searched all the way back to 2006 and didn't find something which would point me in the right direction so here goes...

    Just modded old 16ch Soundcraft Spirit Studio board to +4 from -10. Now the static (which has always been there) has increased. Here's what's been done up to this point:

    -Proper electrical ground
    -Furman conditioner
    -Adequate signal to noise ratio.
    -Climate control on separate circuit.

    Is there a cost effective way to remedy this situation? Should the computer be on a separate conditioner (or ?) from the outboard gear? Does pluging a power strip or two into the Furman encourage static? Seems like the static drops considerably when the computer and Delta 1010's are off.

    Any suggestions?

    I forgot to mention that I've routed power cords away from audio cords as much as possible. This static is loud enough that it is showing up on my meters.
     
  2. bent

    bent No Bad Vibes! Well-Known Member

    When you say Proper Electrical Ground, are you talking about the one outside at the meter? That's the first place I'd look. I had the same problem about 10 years ago. To remedy it I ran a separate wire through the wall to a stick of rebar outside that I drove a couple feet down into the ground. All static disappeared.
     
  3. Yeah- it looks like the ground is attached to a piece of rebar. I didn't really want to do it but I ripped apart my power cord routing to separate the mixer power supply from the other electrical units. Through this I was able to pinpoint the source as the board. I ended up plugging it into a separate circuit and the comb filtering (is that what it's called?) is incredibly less. Barely noticeable in the monitor channel now and nothing detectable in main path.

    I can live with this now.
     
  4. bent

    bent No Bad Vibes! Well-Known Member

    You're on the right track.
    It could be a bad ground in the Furman or the outlet strips.
    Open them up and see if the ground wire is loose in any of them.

    Disclaimer!
    (Turn off and unplug everything first)
     
  5. Jer0176

    Jer0176 Guest

    I agree, it's most likely a bad ground. I wouldn't say this is good advise, but I was recording a band playing live and had horrible noise when the computer was plugged in. I was able to remove all of the additional noise casued by the computer by putting one of those .50 cent ground isolating plugs on the computer. Just in case you don't know what I am talking about, it was one of those adapter plugs grandma had to plug her air conditioner into the old two pronged outlet. That isolates the ground noise made by the computer. Got me by in a pinch, don't know that I would make it a permanant fix.
     
  6. bent

    bent No Bad Vibes! Well-Known Member

    The singer / guitarist of one band I work with has a ring in his bottom lip.
    He learned real quick what happens when you lift the ground like that!

    Zap!
     

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