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be wrote:

I just spoke with a guy who have made both permanent magnets and electro magnets for loudspeakers. He said that the reason that electro magnetic speakers have a smoother and more grain free sound, is due to the temperature rise in the mechanical parts of the magnet, this sligtly changes the mechanical resonance characteristics of the magnet. He even experimented with heating up a permanent magnet of a loudspeaker to the working temperature of the fieldcoil version and was thereby able to emulate the benefits of the latter. So gentlemen, put a lit candle under your compression drivers.

 Eventually the people not just blobbing the imaginary idiocy about electromagnets but taking business and demonstrate sane thinking. Vey very good! If we presume that he is right (and it is very much might be so) then the following thoughts might derive from it:

1)    Is it the “slightly changes the mechanical resonance characteristics of the magnet” or rather it is softening the suspension of the cone?

2)    It would be interesting to measure the primary resonance of the cold electromagnet driver and “hot” one.

3)    The “heating up a permanent magnet of a loudspeaker” does simulate the working temperature of the field coil but it also demagnetizes permanent magnet. The different magnets react differently but still: was it softening sound due to temperature or due to redaction of flux in perm driver?

4)    How your friend (who is he, can you bring him in?) compensates the softening of sound with warm electromagnets? Less loading?

5)    If your friend is correct then I presume that the different cores of the electromagnet might react differently to temperature change.

6)    If your friend is correct and flux acts differently in different temperature then can we use this effect by putting output transformers into a soft heating chamber and impact sound this way?

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