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Here's something for the few who can't afford the expensive ones: https://www.kickstarter.com/projects/excelphysics/the-arc-plasma-speaker?ref=category
Maybe you can diy one from an automotive spark plug I believe I will stick to my Martin Logans for now.
It's a pretty cool design. 30,000 volts is pretty high and the glow in the dark and dancing plasma is an interesting idea. I'd like to see how much that would retail for.