----- Original Message ----- From: Sarah Fox <sarah@gendernet.org> To: <oleg-i@wanadoo.fr>; Pianotech <pianotech@ptg.org> Sent: Saturday, November 30, 2002 9:37 PM Subject: Re: Sitting under the piano > Of > course I also look back over the long hours I spent calibrating sound > systems at a couple dozen frequencies and at levels around 90 - 110 dB SPL. > Hmmmmm.... > > Peace, > Sarah Was this a sound system for an large venue? I have always wondered if audible resultants can be gotten from supersonic frequencies. While standby once I was talking to a sound technician about it. Just as he said "come on lets find out", they said the piano was ready. So I have been "standing by" ever since for another opportunity to find out. For example, would the frequencies of 20,440 and 20,000 give a resultant of 440 ?
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