No. of Recommendations: 1
This is a pitch for funding nonetheless it’s interesting though not what I would say is practical.

Essentially a signal is overlaid (modulated) across a plasma field (a spark). There have been some attempts at plasma speakers but all fail in one major aspect: cannot produce a full frequency of sound. Sure, they could be used as tweeters but even then not so good.

Here’s one that almost works:

Tell me what you think.

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