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Plasmas

I'm currently working on, and have been for some years, a plasma loudspeaker prototype.  It uses a high voltage arc discharge to generate sound rather than a traditional diaphragm.

Here's a nice arc:

I've built a few prototypes and during the work have done considerable detailed research in the field of plasma speakers.  Have a look at www.airspeaker.co.uk for more info on the subject.