----- Original Message ----- From: Bill Ballard <yardbird@pop.vermontel.net> To: Sarah Fox <sarah@gendernet.org>; Pianotech <pianotech@ptg.org> Sent: Monday, December 02, 2002 11:17 PM Subject: Re: 90--110 DB (very OT) > I thinks it's time to hook up two tweeters each to its own frequency > generator, with an oscilloscope in between. Pick two original > frequencies well within the hearing range, say 10KHz and 10.44KHz. > (Their spread represents a comfortably audible frequency.) See if we > can hear a 440Hz tone. And if we can't hear it, can a microphone > plugged into an oscilloscope find it? > > Bill Ballard RPT > NH Chapter, P.T.G. > Or use a Helmholtz resonator? I day dream about how such a thing could be hooked up to a stethoscope and tuned through a wide range of frequencies, like filling it up with water or a piston making it larger or smaller. ---rm
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