atmasphere, I found this article interesting. I do not claim to understand much of it, but appreciate and like what I do read/understand. It speaks even more specifically to your specific implementation of Circlotrons. There is even a blurb about loudspeaker safety as well (in addition to what you have previously stated). To an extent I would consider you a pioneer in your field. Not sure if you had anything to do with the text portion of this article, but you and your company are credited throughout.
https://en.wikipedia.org/wiki/Circlotron
https://en.wikipedia.org/wiki/Circlotron