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Old 25th November 2004, 08:24 AM   #1
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Default Diy Magnetic Sheilding For Subwoofers

So I was thinking, I have a tv that is very sensitive to magnetic flux and I also have a Tumult. It wouldnt be a great combination if either of them were on the same side of the room which makes placement limited.

How could I sheild this?

My ideas:

Thick sheet metal wrapped into a cylinder with an endcap welded on. I was thinking this could perhaps need to be double thick sheet metal wrap to absorb all the stray flux.
I have no idea on what dimensions would be good however.
How might the sheilding effect the flux if it was close enough? I would imagine adding metal around the magnet would only increase flux in the gap? I dont know exactly what kind of metal is proper for it, but I was thinking some sort of soft steel.

Will it work?
Is it possible?
How shall I make it?
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Old 25th November 2004, 11:19 AM   #2
keyser is offline keyser  Netherlands
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ask the manufacturer of the driver!
many manufacturers also produce magnets you can stick at the back of their drivers to compensate for the magnetic field the drivermagnet generates.
I don't think what you suggest would work.
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Old 25th November 2004, 03:31 PM   #3
simon5 is offline simon5  Canada
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You need to use something with steel or iron in it. You could put sheetmetal into the box against each panel...

Yes it will work, but a Tumult generate alot of flux, so I don't need how much steel it will need.
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Old 25th November 2004, 03:45 PM   #4
Mr Evil is offline Mr Evil  United Kingdom
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The soft steel used for casing for most electronics is very good for magnetic shielding, having high permeability and being obtainable for free.

I have used it to make magnetic shielding for speakers used near a TV before. It works alright with a bit of fiddling.
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Old 25th November 2004, 03:47 PM   #5
markp is offline markp  United States
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Look into Mu metal and 'bucking magnets'.
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Old 26th November 2004, 04:50 AM   #6
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I thought about the idea of bucking magnets, but the fact of the matter is, the Tumult has a giant magnet and a bucking magnet of adequate size would get expensive. I have heard of mu metals before, but I dont think I can buy them at any of the local hardware stores. The whole idea of this project was to find a cheap way to sheild subwoofers, if it gets over $50, I'll just be happy with what I have. I suppose I will send an email to adire and ask what they think.

Thanks for the responses
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Old 1st January 2007, 11:11 AM   #7
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I'm now considering this myself. Any luck with it? How'd this one go? Did you hear anything from Adire?
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Old 1st January 2007, 09:17 PM   #8
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Has anyone had luck with the bucking magnets from Parts Express? They're cheap enough.
http://www.partsexpress.com/webpage....ctGroup_ID=825
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Old 2nd January 2007, 01:45 AM   #9
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Why not build a faraday cage? Aluminum foil will get the job done as well.
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Old 2nd January 2007, 06:37 AM   #10
Volenti is offline Volenti  Australia
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Quote:
Originally posted by NVMDSTEvil
Why not build a faraday cage? Aluminum foil will get the job done as well.
A faraday cage has no effect on a static magnetic field.

[edit] there's no known material that will "block" static flux, all you can do is re-direct it (which is what magnetic "shielding" does, offering a path of lower resistance for the flux compared to the surrounding air)
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