This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment ----- Original Message -----=20 From: Erwinspiano@AOL.COM=20 To: pianotech@ptg.org=20 Sent: January 08, 2002 7:03 AM Subject: Re: Stein grand unique board Del=20 I was trying to respond to your last post and hit he delete on your = message,If you see this could you repost it for me.=20 Thanks---Dale Erwin=20 Dale, If it's not this one then it's gone to the great ether hole in the sky: I'll point out once again that the pond analogy is not a very good = one. These are surface waves while the motion of the soundboard--at = least the motion that is creating sound energy is quite different. The = system is vibrating as a unified whole. Perhaps Phil Ford and Charles Fredrick Stein has a valid point = that we should consider the reflective wave as of lesser importance, = though not unimportant, when designing a soundboard system, apparently = Charles did.=20 As Del has said the soundboard system functions as system and = what we seem to be doing here is consider the various individual = component aspects as to there contribution to sound production as a = system. Seems to me like a healthy thing for a think tank to do.=20 As long as there is any vibrations felt in the rim there are = associated energy losses from the soundboard. Whether you view this as = energy not reflected back into the soundboard or as energy losses from = the soundboard to a less than perfectly massive and rigid rim is = irrelevant--it is still reducing the sustain time of the system.=20 Another thought that occurs to me is, that however the listener = would describe the overall sound of the Stein system, that sound will = have to be partially ascribed to the lack of reflected energy from the = rim on the straight side and curved side of the rim even though we can't = dissect or isolate it. Alas another mystery.=20 How would you describe the function of those relatively thick ribs = that--unless I completely mis-read your description of them--remain = solidly glued to the inner rim? Also perhaps the fact that all the end grain of the = soundboard panel is terminated at the belly rail, which as Del pointed = out, adds all the stiffness the trebles require to function. Afterall = sound travels along the grain faster than across. My deduction from all = this is that the tail end of the piano is not as drastically compromised = by having a pseudo free floating edge around the majority of its = perimeter.=20 And I would suggest that this is not even close to being a pseudo = free-floating soundboard system. Free-floating means free-floating as in = not attached to the rim in any way. And those ribs being glued to the = inner rim are not at all free-floating. Nor is the soundboard system as = long as the soundboard panel remains glued to those ribs.=20 Del ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/97/f2/95/67/attachment.htm ---------------------- multipart/alternative attachment--
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