Plasma speakers anyone with info?

Where I work.....a large Semiconductor Manufacturer, we use SF6 in plasma etchers...to etch Silicon. I wouldn't want a cylinder in MY house! Not to mention the EPA showing up to monitor emissions from my Stereo, of all things.
My cats NEVER went near my Maggies....which is supposed to be a problem.
Fluorine compounds in the house? No way!

Magfan, to each his own...ESLs are strongly preferred here over other planar technologies, especially for low level detail. SF6 is more difficult to get these days but not impossible. It does have some benefits. Bias voltage can be much higher than with air (the XG10s with XIM-11 pro unit run around 15-16 kV), and the speed of sound through it is about 1/3 that through air. Wright used that characteristic in the matching XW10 subwoofers (and Watson Labs woofer modules) which have two special 10" woofers and (you guessed it) bags filled with SF6 inside the sealed enclosures. Flat to 20 Hz.

oops sorry...I could swear........

What anyone prefers is OK by me! My entire professional career in semiconductor processing / fabrication has been spent around an absolute AlphaBet soup of Chemistry. I will NOT have any Fluorine or Fluorinated compounds in my house.
With the possible exception of Floride Toothpaste!

While I believe in, and practice good sound, I won't take any chemical risks. Even Helium, an 'inert' gas and technically non-toxic (no chemical reactions) is an asphyxiant.

http://www.solvaychemicals.us/static/wma/pdf/9/8/4/1/Sulfur_Hexafluoride.pdf

Above link is for MSDS (Material Safety Data Sheet) on SF6

What info are you after? From your very brief post it sounds as if you want info on where you can buy a working unit.

Only TWO companies make and sell plasma tweeters - Acapella and Lansche. Both are German. Acapella used to sell the plasma tweeters individually but I think they now only sell them as part of their speakers. Lansche is the same, but they closed the door on tweeter sales many years ago. Unless I am very much mistaken, you will not be able to buy these from the factory.

I think that Brian Ackerman from AAudio Imports is a member of Audiogon, so he may be able to advise you on whether you could buy one.

Your other route is to DIY a pair. I have seen circuit diagrams on the web. My own skills are very modest - I can't even put together a doorbell kit from Radio Shack let alone tackle a project like this!!

Going on specs alone the Lansche is more desirable. The plasma flame is twice the size of the Acapella, consequently it can go lower - 5kHz for the Acapella, 2.5kHz for the Lansche. Neither unit tolerates low frequencies beyond the stated crossover point very well, so steep filters are necessary. The Acapella has a crossover built in - the point and slope are configurable by changing internal components. Not sure about the Lansche.

If you want to know what they sound like - I have a pair of Acapella Violons.