One 10v-4200v transformer + audio amp = plasma speaker. Yes, it's that simple, though good luck finding the transformer. In reality, it seems to put out about 40,000v; takes 10000v to ionize one cm, and the longest arc I've gotten is about 4cm. If I touch a dry 2x2 to the positive, you can actually feel a tingle, which is interesting. For some reason, I seem to be getting a yellow color from the arc at the highest power levels along with the typical purple; I'm not quite sure why. Ionizing CO2, perhaps?
Should try and see what this does to the sonoluminesence.
