Topic: Magnets and Speakers

[atomicat10]

What are the best characteristics of a magnet for audio purposes?

What are the best magnets (for audio) out there?

[av_phile1]

Common are Ferrite core iron magnets. But they exhibit less magnetic field strength per unit area than the more exotic and expensive Neodymium or Alnico types.   There are good speakers in any of these types.  A good speaker is often a combination of many design considerations and compromises.

[atomicat10]

Sir how is AV shielding done? I've read that these magnets can affect other electronics.

I've heard that neodymium magnets require a long break-in period but once achieved, it really outperforms other types? Is this true?

[av_phile1]

Sir how is AV shielding done? I've read that these magnets can affect other electronics.

The magnet basket is enclosed with lead, aluminum or some non-magnetic basin.

I've heard that neodymium magnets require a long break-in period but once achieved, it really outperforms other types? Is this true?

Magnetics and electronics do not require break-in, contrary to common misconceptions.  Only mechanical devices need break-in.  Like motor vehicles.  Admittedly, speakers are electro-mechanical devices.  The rubber or foam or cloth suspension and spiders perform a mechanial role and may benefit from a break-in period.  But not the magnets.  If at all, the magnet will decrease in flux strength over time.  And that's no good. 

Just a note.  There is no break-in period that can make a lousy speaker out of the box sound better over time. A good speaker is always good right out of the box.  IF it becomes better over time, the mechanial compliance of the spider and the surrounds may have benefitted from this "break-in" period.  But this can also be psychological.  As the human mind can grow accustomed to the sound over time.   

[atomicat10]

Thanks. Got it.

If at all, the magnet will decrease in flux strength over time.  And that's no good.

So this is where a powerful magnet (say,Neodymium) stands out because it is not that affected by the flux weakening effects of time , True?

Neodymium magnets are lighter, stronger and more heat resistant. True?

[av_phile1]

Am no maget expert.  But what I know is that neodymium-based microphones often have 6db more output than non-neodymium mics of the same design.  They have greater magnet strength than any material for the same size (and pressumably weight), including the Alnico compound. 

[atomicat10]

Am no maget expert.

This Man is



Take a Stand on May 26

Thanks a lot Sir AV

[qguy]

my understanding is that shielding should be done with a material that attracts the magnetic flux inorder for it to be absorb by the shielding

The magnet basket is enclosed with lead, aluminum or some non-magnetic basin.

[av_phile1]

You could be right, but my understanding is that a material with the ability to absorb magnetic flux could eventualy be magnetized to become itself a source for magnetic flux.   But I leave that to magnet experts.   

[rascal101]

my understanding is that shielding should be done with a material that attracts the magnetic flux inorder for it to be absorb by the shielding

A belly band that is connected to ground is typically used for transformers to couple leakage flux to ground.

[joey]

how can i shiled the magnet in order to put it on top or buttom of crt monitor?