This is the area of the scale that would likely most benefit from higher bridge stiffness and mass, yet the bridge is shorter and correspondingly less stiff. And the addition of the same amount of bridge thickness will effect a larger percentage of change in the treble compared to lower down in the scale. I'm not sure the benefits are necessarily so local. We've addressed the why so as to the how? Well I deduce that a stiffer bridge simply helps to distribute the load of the individual unisons more equitably upon the diaphram. How this exactly translates into a more efficient transducer I can only speculate, although it makes sense to me. If the only changes that need to be made in the action to accommodate changes in bridge height on the topside bridge are the hammer bore distance, and there are no other attendant penalties; then it would remain the simplest possible way to effect the desired change. Will Of course, changing the bore distance does affect the entire action leverage... Jude Reveley, RPT Absolute Piano Restoration, LLC Lowell, Massachusetts (978) 323-4545 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090324/15e449ad/attachment.html>
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