Tweakers' Asylum

re: magnetic material

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unclestu

A

In Reply to: RE: Sounds like the old magnet trick posted by gbehappy2 on November 12, 2010 at 15:46:54

A magnetically permeable material will move magnetic fields faster when in their presence. I have used mu metal and iron foil for the same reason and with similar effects.

In fact a stack of mu metal foil sheets located between the drivers of a two way system will dramatically reduce the crossover effect, a large part of which I believe is due to the magnetic fields of the drivers interacting with each other.

Stu

Follow Ups:

RE: re: magnetic material - gbehappy2 08:48:10 11/18/10 (2)
unclestu, thanks for the post. I am not familiar with mu metal(and a lot of other things). Where can I get some, and what is the best way to install the foil between my drivers?
kendo
- RE: magnetic material - unclestu 14:24:49 11/18/10 (1)
  Mu metal is fairly expensive stuff. If using other than foil it requires special treatment to retain its magnetic properties.
  
  Cheaper alternatives would be to use nickel foil (Mu metal is made from nickel and specially treated to be magnetically conductive, a special pure hydrogen bake out is the essential part of the process, not recommended for home trials). You can also use any ferrous material first as experimentation. Machine shops often have steel shim stock which you can easily cut.
  
  There are several sources of Mu metal, if you do a google search. One company (sorry I forget the name) even sells an experimenter's kit. IIRC, their website also had great advice for using their products.
  
  Stu
  - RE: magnetic material - rick_m 08:48:08 11/19/10 (0)
    We were considering building a large screen room (for audio frequencies) where I worked and I looked into material for it. mu-metal was too expensive but galvanized steel, the stuff sheet metal companies make things out of, looked like it would work almost as well and was dirt cheap.
    
    We never did the project so I don't have performance data but it might be fun to try for home audio.
    
    Rick
RE: re: magnetic material - gbehappy2 16:34:31 11/12/10 (0)
unclestu, thanks for the thoughts. Gives me some ideas to experiment with. Will post if results are positive.
kendo

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