Hey, guys check out http://www.ee.vill.edu/~cdanjo/plasma2.html I once had Ionovacs. They were truly exceptional, making you think all other drivers were crap, which of course is true. I tried them with double Quads, Linn Isobariks, Fulton Premiers, and even Klipsh corner horns. They always stood out as better than what they were mated with. Ultimately I gave up and sold them.
Since the Acapella tweeters are the outgrowth of the Ionovacs, I am truly amazed that they can pull off mating the tweeter with horns and an enclosed woofer.
I have Beauhorns and have been tempted to try plasma tweeters, except that I well remember my experience with the Ionovacs. I am, however, looking for a pair of Coronas if anyone, Detlof, knows where I can find them.
Norm