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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox’s S2 Survival Guide.
Post Subject: Fieldcoils was Re: Fun thread.....and fireplace Posted by cv on: 4/14/2005
The point of the field coil is to saturate the piss out of the magnetic circuit so that the coil flux does not modulate the motor. Romy, I suspect that your experience of them may be based on an older drivers where saturation was not the name of the game; I would expect a proper saturated motor to lean more to the sonic characteristics you're after.
In theory, you could achieve much the same result with alnico (a la ALE, Lowther PM4) or neodymium but there may be something more to the field coil approach. The Cogent boys are convinced of the superiority of the FC approach; they are not about saving money, rather, creating the best driver they know how. Hence the proposed use of permendur polepieces.
It would probably be *much* cheaper to achieve a similar flux with Nd magnet but there is probably more to it than that. I know Guy has some experience of the AudioNote FC MC cartridge and will hopefully chime in here.
Cheers
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