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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox S2 with Electromagnets
Post Subject: Re: Chave coil controlPosted by guy sergeant on: 4/26/2006
I had to dismantle a friends chuffing PM6A drivers the other day (only to find that the foam spider had disintegrated after 5 years, nice work Lowther) What was interesting, possibly, was the coating that Lowther seem to be applying to the voice coil inside & out. I remember reading a piece about something called the Chave Coil control which Donald Chave was looking at before he died. This coating looked like some kind of ferric paste. Must add some weight but I don't know how or what benefits it is supposed to bring. Lowther also used Permendur on the PM4 magnet to allow for greater flux density but it is supposed to be a, very expensive and b, very difficult to machine. I also don't know whether the benefits are worth the trouble. (Ale use it, maybe to justify their prices!)
The other issue (heat) used to affect the electromagnet cartridge I used to use. Too much current the cartridge body got too warm and the rubber damper wouldnt work properly.
You'd probably need to redesign the S2 chassis as a more effective heatsink if you aren't going to water or helium cooling.
rgds,
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