It's also caused by poorly voiced hammers. Refer to the item 2 of the hammer voicing section in the following document. http://www.lloydmeyer.com/PDF/Voicing_the_Renner_Hammer.pdf An Estonia grand I serviced before had this problem. Yoshi On Wed, Jun 2, 2010 at 11:19 AM, Joe Wiencek <joespiano at gmail.com> wrote: > This subject was heatedly debated recently, that is, which is the source of > extraneous noise, poorly mated hammers, or issues relating to duplex length? > I just want to throw out another question, because I'm not a scientist. > What about upright pianos? Even with poorly shaped hammers, I don't > encounter too much noise in uprights? Any one with more empiricism care to > comment? > > Joe Wiencek > > > > > > > > >
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