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Strange question... Regarding sheilding monitors..

Discussion in 'Monitoring / Headphones' started by fabpab, Apr 19, 2004.

  1. fabpab

    fabpab Guest

    Hey there people..
    I have a great pair of mini monitors that i want to use close to the monitor.. however they are not sheilded!
    so have you any ideas how i could make the monitors sheilded? so that i can use them close to my monitor..
    im asuming that i have to surounf the magnet some how..
    cheers for any replys!
     
  2. Thomas W. Bethel

    Thomas W. Bethel Well-Known Member

    You will be looking for MuMetal

    Not cheap

    http://www.zetatalk.com/info/tinfo22p.htm

    http://www.magnetic-shield.com/

    http://www.mushield.com/

    http://www.lessemf.com/mag-shld.html

    Best of luck!

    -TOM-
     
  3. Barefoot Sound

    Barefoot Sound Active Member

    Mu metal isn't necessary. Steel will work.

    You can wrap a few layers of galvanized steel flashing around the top, bottom and sides of the cabinet. Just coil it around and don't make the corners too sharp. Bring it all the way to the front edge of the cabinet. If the flashing extends beyond the rear edge, that's good. This will give better shielding. You can put a thin layer of high density foam around the cabinet first, then construction glue between the metal layers to cut down vibrations.

    If you're more adventurous, you could add "bucking" magnets to the back of the speaker drivers. However, this can somewhat alter the driver parameters, so you could potentially change the sound.

    Thomas
     
  4. Thomas W. Bethel

    Thomas W. Bethel Well-Known Member

    Depending on the steel you could just as easily magnetize it which would be a lot worse since it is a lot bigger surface area. If you want to do it correctly use mumetal.

    -TOM-

    Been there done that.....!
     
  5. Sanity Inn

    Sanity Inn Guest

    Just a thought,

    think the " copper " boat paint for hull would work?

    i here some guitarists paint inside of hte pickup cavity to help reduce noise ?

    wunder if this would work as a sheild,,,?

    and i dont suggest painting the monitor lol but maybe a box around it,,

    Sanity Inn
     
  6. Barefoot Sound

    Barefoot Sound Active Member

    Sanity,

    No, copper won't work for a static field from a permanent magnet. You need a "magnetically conductive" material to redirect the field - like iron, steel, or some of the more exotic material.

    However, electrical conductors do help with fluctuating magnetic fields. With fluctuating fields, there's always an accompanying perpendicular electric field component. It's just the nature of electromagnetism. The conductor will shield the electric field component and, therefore, the magnetic component can't propagate either. Power transformers (60Hz oscillation) will often have copper foil shields wrapped around them to reduce their emissions.

    Thomas
     
  7. noit

    noit Guest

    You could save yourself time (and money from the sound of some of these solutions) buy getting a flatscreen. Bingo, problem solved.

    Also, now you wont have the problem of interference with electric guitars. It took me forever to find out that the noise my Fender bass made was really interference from my CRT.
     
  8. Sanity Inn

    Sanity Inn Guest

    Thanks Barefoot, and noit ...


    Yes my ATC monitors are not sheilded either, and you should see the size of the magnets in these puppies,,,


    I plan on two LCD myself, but when budget permits,,,


    although my monitors are 6 feet apart,,, not messing with my monitor,,

    my hummble set up, shows the size of magnet on ATC SCM-20's

    http://


    Sanity Inn
     
  9. Sanity Inn

    Sanity Inn Guest

    hey!!

    Noit, regarding the noise to pickups and CRT's,,,, I guess this includes pick ups on accoustic guitars?

    is it because the CRT is plugged into same sytem or is it a proximity thing ?/

    i usually record about 6 ' away from monitor ...


    Thanks again
    Sanity Inn
     
  10. noit

    noit Guest

    It's proximity. When I had a CRT I would turn it off before recording anything with a pickup. Might be a good idea for microphones too. I'm not sure.
     
  11. fabpab

    fabpab Guest

    Interesting fact..

    A 17" CRT has a viewable screen size of 15"
    A 17" TFT has a viewable screen size of 17"

    Therefor to buy the equivilent TFT to your 17" CRT monitor you only need to buy a

    15" TFT!!! WAHOO!!


    :)
     

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