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RE: Field coil vs permanent magnet -Fundamental differences besides the obvious?

There is no essential difference between any given field coil speaker and a permanent magnet speaker beyond the motor/magnet. Any field coil design can be made as a permanent magnet, or vice versa. A field coil motor in itself is no guarantee that a speaker will sound good. It is true, however, that many of the early, high efficiency drivers which used a field coil electromagnet out of necessity sound superb. While many attempts to do field coil speakers today miss the mark- probably because the knowledge, craft, art, or however you wish to call it for making such speakers has largely been lost through more than a half century of neglect.

I'm typing this while listening to modern field coil drivers on horns (Cogent) and the sound is indeed remarkable.

Jonathan

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