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In the Forum: Horn-Loaded Speakers
In the Thread: Tweeter for Vitavox S2. High-sensitively ribbons?
Post Subject: Scandinavian laser earthquake airport ribbonsPosted by Ronnie on: 10/19/2006
Perhaps this scandinavian has a pair of tweeters to sell.
http://www.transmissionaudio.com/ourspeakers.html
You'll be happy to read about the alternative ways to use some of his speakers:
* two-way communication at an airport check-in
* 3D-capacity Earth Quake warning system
* 158 dB @80kHz for scientific purposes
* can also work as “Acoustic Lasers” to protect for example Airports and Cruise ships
Plenty of inspiration there for the "Recent Audio News" section if you don't like the ribbons 
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