Speakers that operate like this have been around for 30+ years under the name hypersonic sound. The original company “HSS” went under and/or pivoted to making

Speakers that operate like this have been around for 30+ years under the name hypersonic sound. The original company “HSS” went under and/or pivoted to making Lrads. You can still occasionally find their speakers on ebay. I bought one 16 years ago. It was pretty fun but definitely did not have the promised fidelity… the range and directivity was everything and more than it promised. We tested it out to a mile and could still hear it. Very cool.