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<blockquote data-quote="Jack Arnott" data-source="post: 145830" data-attributes="member: 304">Re: Speaker repair/rebuild questionsThat DIY field coil is incredible. Have not checked in on that in a while. The best sounding speaker I have ever heard was field coil. And it was limited to about 12k on the high end. Two way system with two horns, crossed at 350hz. The draw back to field coil is cost. Twice as much power needed, and twice as much heat to dissipate. So not practical for live use. There are other drawbacks too. The system I heard was &quot;priced&quot; at $75K, but that was more a thought than a marketing plan. They only have the one, and never sold it. Think of it as the difference between a dynamic mic, and an electret condenser. Same principle, in reverse. The sound board provides the power, instead of a magnet as in a dynamic. Same difference in sound. With a magnet, the flux density changes with the power band. (Less so with alnico, but alnico is very expensive anymore, and other political reasons too deep to go into.) With field coil the flux density is much more stable, and so the sound is more refined.</blockquote>

[QUOTE="Jack Arnott, post: 145830, member: 304"] Re: Speaker repair/rebuild questions That DIY field coil is incredible. Have not checked in on that in a while. The best sounding speaker I have ever heard was field coil. And it was limited to about 12k on the high end. Two way system with two horns, crossed at 350hz. The draw back to field coil is cost. Twice as much power needed, and twice as much heat to dissipate. So not practical for live use. There are other drawbacks too. The system I heard was "priced" at $75K, but that was more a thought than a marketing plan. They only have the one, and never sold it. Think of it as the difference between a dynamic mic, and an electret condenser. Same principle, in reverse. The sound board provides the power, instead of a magnet as in a dynamic. Same difference in sound. With a magnet, the flux density changes with the power band. (Less so with alnico, but alnico is very expensive anymore, and other political reasons too deep to go into.) With field coil the flux density is much more stable, and so the sound is more refined. [/QUOTE]

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