Tesla Plasma Loudspeaker

The Tesla Plasma loudspeaker uses an electromagnetic field surrounding a high voltage field to produce sound when modulated by a carried audio signal. Nikola Tesla invented/discovered the phenomenon sometime during the first half of the 20th century. Whilst able to deliver a full frequency response it is not very practical and not very efficient though the way it lights up is pretty. I bought one on line just to explore it. I hope that you are intrigued enough to try one for yourself.