Actually, this interested me more.
Its a solid-state tesla coil (SSTC) that can be audio modulated. The plasma that makes up the arcs is what makes the sound occur.
There are (and have been for a while) commercial plasma tweeters (speakers), though, like this TC transducer, they are limited to shorter wavelengths as well as only odd-ordered harmonics (which is good, actually).
Couple this with a high-voltage planar low-freq electro-static driver (and some exotic wood cabinetry) and you get the picture. They used to sell these in audiophile shops for a lot of money, though you'd be buying more novelty than fidelity.
This takes a LOT of voltage/amperage.
Those are awesome vids! Thanks for sharing them!
Quieter play with electricity, this time we're in zero gravity and use a weak electric field.
I have an 10 y/o autistic step-son. He likes to do this one with his plastic comb and "bending" a weak stream of water from the faucet, …in 1G gravity.
This forum needs more geek stuff like this.
Ahhh… I found the Geek thread.