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Art Welter Messages: 417 Registered: October 2007 Location: New Mexico
Has No Life
Air starts to become nonlinear well below 160 dB, one reason the manifold HF driver approach does not work so well, more in does not translate to more out.
There is an absolute spl limit, air compression to liquid then to vacuum, (max compression to rarefaction) which occurs around 194 dB SPL as I recall.
Tom Danley’s acoustic levitator, using four special piezo transducers tuned to around 22K in a tetrahedral formation could float styrofoam at around 158 dB, and platinum just over 160 dB, if I remember correctly.
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