Shielding a DIY kit

Discussion in 'Home Theater Projects' started by JoelTaylor, Aug 20, 2004.

  1. JoelTaylor

    JoelTaylor Auditioning

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    Hi I have built a kit from an Aussie crew called Accusound. The centre channel kit did not come with shielded drivers. There are 2 x 6" 120w drivers. They are placed about 1.5 foot above the TV and still cause interference with the picture. I went to a local guy who makes custom speakers and he suggested lining the box with stainless steel. I did this but with no success. Can someone please give me some advice on shielding this box?

    Thanks for your time

    JOEL
     
  2. MarkRoberts

    MarkRoberts Stunt Coordinator

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    I believe what you are looking for is "bucking" magnets. You glue them or otherwise attach them to the inside of the cabinet in opposite polarity of the driver magnets. They should be trying to push each other away. I am sure the veterans on the site might have some tips or tricks to help you.
     
  3. Andrew S-

    Andrew S- Stunt Coordinator

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    Stay away from expensive materials. Just get some baking sheets and cut them to the right size to block where you need it. You can double up if needed.
     
  4. ThomasW

    ThomasW Cinematographer

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    You should smack the local guy in the head!

    You should use 16 gauge sheet metal. Line the insides with it. Don't bother with the back or the front baffle

    Then as was suggested use bucking magnets.

    You need to be careful with the baking sheet recommendation many of them are aluminium and that doesn't work.

    If you're feeling rich them pop for some MuMetal it's best shielding available
     
  5. Andrew S-

    Andrew S- Stunt Coordinator

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    YEah I guess I should have said non alum [​IMG]
     
  6. JoelTaylor

    JoelTaylor Auditioning

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    Where do I get these "bucking magnets"?

    I am in Australia.
     
  7. JoelTaylor

    JoelTaylor Auditioning

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    When you say sheet metal ThomasW how does that differ from sheet stainless that I have used?

    My brother is a sheet metal worker and he says that stainless is sheet metal.

    Are you referring to mild steel?

    Thanks for your help.
     
  8. Paul His

    Paul His Agent

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    Your sheet metal needs to be a ferrous metal - steel. That's why your stainless isn't working - it's non-ferrous, non-magnetic, exactly the opposite of what you should be using.

    Paul
     
  9. JoelTaylor

    JoelTaylor Auditioning

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    Thanks Paul. I will get some.

    Can anyone point me in the right direction to buy the "Bucking Magnets"
     
  10. ThomasW

    ThomasW Cinematographer

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    I don't have a clue where to get bucking magnets in AU. Parts Express has them for cheap BUT they're heavy.

    Might check in the DIY Audio loudspeaker form, lots of people from AU post there.
     

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