Awwww heck, just call Yamaha or Kawai and ask them. Take the easy way out. <G> -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Ron Nossaman Sent: Wednesday, August 05, 2009 3:46 PM To: pianotech at ptg.org Subject: Re: [pianotech] Soundboard deflection - Pitch raise Ryan Sowers wrote: > I wouldn't say its indefinable. We know the pitch drops - we know the > structure is flexible, we know that the components of the piano are > interrelated. My whole point earlier was "how could there possible be > ONE cause?". There isn't one cause, and no one is trying to say there is. It's a number of things. The question is to what degree each of the known and suspected variables is responsible. > How would one construct an experiment to accurately measure all the > structural changes in a piano before and after a pitch raise? It would > be necessary to detect and measure very small changes in the structure. It isn't possible to account for all the possible variables in ANY system. The best you can do is isolate one test at a time for one cause and find out which suspects cause the greatest change. In this case, it would be relatively easy to measure bridge height relative to rim height during the process to see if soundboard deflection is it. So why isn't everyone out there doing it to learn what is really happening? Realistically, they don't care, or know they wouldn't be believed no matter how many numbers they produced because everyone was taught that it's the soundboard deflection, and that's that. It's just too much trouble to re-learn something anyway. > We should definitely use some "lasers". If we could get something in the megawatt range to play with, count me in. Ron N _____ avast! Antivirus <http://www.avast.com> : Outbound message clean. Virus Database (VPS): 090805-0, 08/05/2009 Tested on: 8/5/2009 5:01:09 PM avast! - copyright (c) 1988-2009 ALWIL Software.
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