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BassAwdyO 25th November 2004 09:24 AM

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?

keyser 25th November 2004 12:19 PM

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.

simon5 25th November 2004 04:31 PM

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.

Mr Evil 25th November 2004 04:45 PM

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.

markp 25th November 2004 04:47 PM

Look into Mu metal and 'bucking magnets'.

BassAwdyO 26th November 2004 05:50 AM

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

paulspencer 1st January 2007 12:11 PM

I'm now considering this myself. Any luck with it? How'd this one go? Did you hear anything from Adire?

Andersonix 1st January 2007 10:17 PM

Has anyone had luck with the bucking magnets from Parts Express? They're cheap enough.

NVMDSTEvil 2nd January 2007 02:45 AM

Why not build a faraday cage? Aluminum foil will get the job done as well.

Volenti 2nd January 2007 07:37 AM


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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