More homework, and it's sunny outside. Where to start?
edit: I watched the first and third videos. They don't describe the polarity and orientation of the magnets. ;(
https://en.wikipedia.org/wiki/Plasma_speaker
Quote:
Practical considerations
Plasma speaker designs ionize ambient air which contains the gases nitrogen and oxygen. In an intense electrical field these gases can produce reactive by-products, and in closed rooms these can reach a hazardous level. The two predominant gases produced are ozone and nitrogen dioxide.
Plasmatronics produced a commercial plasma speaker that used a helium tank to provide the ionization gas. In 1978 Alan E. Hill of the Air Force Weapons Laboratory in Albuquerque, NM, designed the Plasmatronics Hill Type I, a commercial helium-plasma tweeter.[9] This avoided the ozone and nitrogen oxides produced by radio frequency decomposition of air in earlier generations of plasma tweeters. But the operation of such speakers requires a continuous supply of helium.
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A flame speaker uses a modulated flame for the driver and could be considered related to the plasma loudspeaker. This was explored using the combustion of natural gas or candles to produce a plasma through which current is then passed.[11] These combustion designs do not require high voltages to generate a plasma field, but there has been no commercial products using them.
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I read about this in the 1980s. They suggested to make a sub-woofer the flame would have to be an out-of-control oil well fire.