Trial and error. See what sounds best. I think after doing it to a few pianos, you start to get the hang of it and after looking at the design, he who can process those kinds of observations has a pretty good idea of what will be needed where. For those others of us - trial and error - same end point, just takes longer. Terry Farrell ----- Original Message ----- > I am curious as to just what criteria one uses to <<tune impedance>>. Is > this a trial and error thing or is there a systematic way of doing > this... or is one measureing impedance somehow and calculating how much > mass to add and where to add it. > > Thanks > > RicB
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