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Hi Haralanov.

My "friend" said that he made an experiment where he heated a permanent magnet up and thereby made it sound more like a field coil magnet, both with the same front.

If we can take this claim as true, it is evidence that the acoustical-mechanical vibrational properties of a transducer depends on the temperature, this is not counter intuitve to me, especially with the mechanical interfaces causing damping and the temperature dependent softening of glues and insolation of speech coil etc.
I dont think this would be the only explanation, obviously the magneto-hystersis properties of the hard and soft iron parts could in adition be as, or more important.

Regards
be

Rerurn to Romy the Cat's Site