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If you're familiar with the audio spotlight, then you now how very awesome narrow beam ultrasonic speaker devices can be. They can project a sound efficiently over long distances without spreading like common speakers. One can essentially walk into the ultrasonic line-of-fire and begin to hear sound abruptly - certainly an interesting effect.
Though not much for documentation & details - this instructable shows off a transducer packed parametric speaker design. Hrmm, it seems the author is selling kits and sharing a good deal of info here. Apparently this setup will introduce a substantial amount of distortion to your signal - ultrasonic audiophiles be warned. - How to make parametric speaker
I'm interested in the kit, but I have some questions and can't seem to ferret out an email address for the person/company/whatever that sells the kit. Anyone have better luck?
That being said I'm wondering how much volume I can get out of this rig over longer distances, say 50 meters.
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I have too have similar questions.
also thinking, the kit would be pretty easy to source parts for - keep an eye out for good deals on appropriate transducers
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