---------------------- multipart/alternative attachment > Hi Kevin and Johnathan, I think what you are referring to, is a phenomena known as string coupling. Typically it is in the .1 to .2 cent range. ( Just audible to me. 1 or 2 cents would be clearly audible) For a long time I thought it appeared random and more noticeable in the treble. Since I have been observing the effect with respect to rib location. I am stating to conclude that the effect, is greater at the mid point between the ribs. Stiffness of the board is critical in the treble, and I think that is why it is most noticeable in this register. I suspect that the effect is proportional to the fundamental frequency, and the stiffness of the board in any particular area. This is why I think it is less noticeable in the lower registers. Just a rambling theory. I have not measured enough pianos to really have a firm opinion on the subject. Regards Roger >Somewhat off topic (or is it) ... I remember Virgil Smith doing a study >here once where he showed that tuning unisons caused the pitch level of >the note to drop. I believe it was something like 1-2 cents. (anyone >know what I'm talking about, or have I gone mad?) > > I saw that demonstration too. In our class, it could be demonstrated > by hearing the beat rate of the third tenth octave check, but they had > trouble measuring it with a machine. > Kevin E. Ramsey > > >Jonathan Finger RPT. >Boulder Chapter, PTG ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/2a/48/1c/3e/attachment.htm ---------------------- multipart/alternative attachment--
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