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Romy,
I was asking questions here, and @ RMAF because I'm trying to gather enough information to build compression drivers.  
At my day job I am a prototype machinist at Los Alamos National Lab.  I don't plan on going into production, just to build a few good ones.

I had planned on using field coils at first, (as adjustable magnets) to determine how strong of magnets would be most effective, like using pots in a circuit, then replacing them with good resistors. 
I was concerned about loss of transients after reading your experiments with converting Vitavox drivers, with no other changes, losing transients... 
I hadn't thought of it before, but maybe you hit on the reason for Feastrex using so much Permendur? 
Like Mundorf silver-in-oil capacitors.  The oil damps the otherwise overly bright silver sound. 
And yes, that sure sounds like the hard, expensive way to go about it. 

For what ever it's worth, I just remembered, they said the Feastrex cone paper was made from Mulberry bark.  What I did find interesting though, was next door, another guy from Japan had a few prototype compression driver diaphragms he had stamped out of pure Magnesium.  Very hard to stamp, but very light, and might have a good sound--not "ringy" like titanium. 
Robert

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