Acapella ion tweeters


Does anyone know about Acapella ion tweeters (specifically the TW1S)? I would be interested to know about the following:
1) If you have any experience with them, are they really the best out there? Are there are other tweeters which can match their speed? Are there others with similar technology?
2) Did they have ozone problems at one point or do/did all extant versions of the TW1S have it licked?
3) Are they now available separately? I remember reading in a post many moons ago that they only came as part of their speakers (I believe the mysterious Detlof was the author) but the website has a separate listing for them. And if available separately, does anyone a) have ANY idea what they might cost? and b) who in the US or Europe (or even better, Asia) might sell them?
Thanks, Travis
t_bone
I just found the real page that I wanted to post. It is http://members.aol.com/uhaumann/index.htm
I just found the real page that I wanted to post. It is http://members.aol.com/uhaumann/index.htm
Norm sorry, have no idea, where to find Coronas, in fact I must admit, I didn't even know they existed. You are right, it is quite difficult to mate the plasmas with the rest of the system and I found, I could only pull it off together with my stators, when I gave them a dedicated amp and preamp chain, so I could tune them in the way I wanted it.(Spectral) The effect on the soundstage, apart from the highs of course, was phenomenal.