Ron O said: <Indeed, and the lower bridge root height would tend to allow the board more flexibility over its speaking area, which would lower impedance and would allow for something of a more distorted tone, ie. honking tone. Lack of board stiffness would seem to be one of the most commonly overlooked factors, when it comes to tone building. I wonder then...Fast forward to the current Phoenix system. The bridge height reduction/stiffness problem, at least in a retrofit, has to be present since there is maybe a little room to raise the plate, but not 10mm or whatever the height of a Phoenix aggrafe is...no? If this is so, meaning retrofit Phoenix agraffe bridge height is reduced and the stiffness/load contributed by the bridge is reduced, does the fact that these agraffes function with zero bearing change the calculus of overall board impedance? I guess the first shot at answering this would be to know what bridge height is on a Steingraber Phoenix, or (I believe) Stuart Pianos, pianos which I assume were designed with the agraffes in mind from the ground up? Jim Ialeggio -- Jim Ialeggio jim at grandpianosolutions.com 978 425-9026 Shirley Center, MA
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