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Message: <blockquote data-quote="T3mpest" data-source="post: 8132889" data-attributes="member: 560148"><p>Dan Wiggins who used to own adire audio and invented XBL^2 tech used to design acoustic levatation devices for the military.  I remember he said  firing it at close range next to a concrete block and he could put burn marks on the concrete..   It's invariably a horn loaded design, probably a front loaded or tapped horn array with a very narrow bandwidth both in off axis response and frequency response..  Alot of energy over a very small area.  Actual speaker type, maybe some sort of ribbon, not many speaker go to 24khz without inductance rolling it off.  Probably all kinds of copper or even silver in the design, stupid expensive I'm sure haha.</p></blockquote><p></p>

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