Hi Steve
Always encouraging to hear from someone with a slightly contrary opinion.
My 2 cents of experience in this area is ; After inserting an "inline" suppresion resistor ( equal to the drivers nominal impedance ), And using cascaded HF bypass caps with the approach that their multiple, minute "timing-errors" can actually be utilyzed as a "quasi" D to A reconstruction filter, well - I haven't heard "tizzyness" for quite some time ( unless of course, I change CD players and have to start cap-matching all over
).
Somewhat a bit more seriously; I think I would need to listen to my phenolics for a much longer time to wean my ears away from the sound of metal. I tried that yesterday ( after your posting ) but the spacial "disconnect" I get when a tweeter is added ( I'm just not a tweeter guy ) - makes me switch back fairly fast. And my tweeters aren't junk. I have many ancient Fostex T945N(s) ( the Fostex [Pros'] answer to the 2402 ) plus a friends' 2404s.
Did you ever form an opinion on the sonics of the 475 driver ?
regards < . Earl K