----- Original Message ----- From: Nathan Bower <nathan@bowern8.plus.com> To: Sarah Fox <sarah@gendernet.org>; Pianotech <pianotech@ptg.org> Sent: Sunday, December 01, 2002 3:56 PM Subject: Re: 90--110 DB (very OT) > I have heard that organs can create beat frequencies below the normal > perceived cutoff of the human ear (5-10hz). Does this fit in with what you > are saying? Do we just 'imagine' the very low frequency, or does it really > exist? > I would say 5 to 10 hz is perceived as a beat frequency. The beat rate of C4--E4 is a little over 10 hz or cycles per second. I have heard two tones, C2--D2 (C4 is middle C) played together on a pipe organ and a beating resulted that sounded like 8 per second. This was called a "resultant". If you have access to a synthesizer or digital keyboard that has an organ "voice" on it that is something like "16+2" or 16+4 play C3--D3 and you will hear a beat that is like 8 bps. It is REAL on my Yamaha SR-340. ---ric (the "r" stands for resultants r real)
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