>Hi Don, > Take a close look at the position of the ribs, wrt to the >coupling effect and each note, Things tend to look less random. I have >only measured the effects on two pianos, but I am starting to think that >the mechanical reactance of the board may have some thing to do with the >coupling effect. > >Roger > > >>Hi, >> >>I read this with great interest. I wonder if the damping effect of the cast >>iron and the resultant energy *bleed* is the cause of the lowering of the >>pitch on three string unisons. It would certainly be variable from piano to >>piano as plates are not really too consistent. Hi Don, Roger, Have either of you tried the experiment I posted a while back of comparing this pitch drop with the duplexes muted and open? Ron N
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