Dear List, I work for a dealer. I have received many complaints concerning loud overtones from some unisons. Pianos of every manufacture have them I've noticed, especially from the bass strings. Voicing the hammer and seating the strings does not help. About the only solution I've found is to needle the hammers excessively, but of course the tone is ruined then and out of balance with the other hammers. Only their Chinese customers find this to be a problem. They think the piano is defective with these extraneous noises emanating only from 1 - 5 unisons in the piano. I perceive the problem to be scaling oriented, but do not know how to explain to the customer why it only occurs with certain unisons and not others. Has anybody found a good way to deal with or explain to the customer the nature of this problem? It has nothing to do with sympathetic vibrations, the overtones are not pure, and they come from a single unison. Waiting for your thoughtful reply. Joel Swafford, RPT
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