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How do they work?

You guys have formed an interesting thread and clearly both know far more than I about ion tweeters. I did a quick Google and what I found were modulated Tesla coils. At least I understand part of that technology having built spark-gap excited ones as a teeny. Talk about EMI generators...

Is it correct that the coupling mechanism of the tweeters is heat? I remember that some used to use He which I think was to keep the plasma away from O2 to avoid generating ozone. If that's the case it seems to me that the interface of the He to air interface which has ~ a 3:1 density mismatch would cause reflection problems.

If indeed the mechanism is heat then why isn't the drive asymmetrical due to the Carnot efficiency being higher in the expansion phase?

I'm not likely to actually use them but I am curious.

Thanks, Rick





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