This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment I think this is right. From the recent discussion on how much the action = parts flex, especially on a concert grand because of the heavier = hammers, the backcheck could brush the hammer tail on a FFF blow but not = be detected by using your hand to pressure the hammer and won't happen = unless you try to hit a very hard blow. That would decrease the volume = only on the hardest blows but not have an effect on soft or medium = blows. Lowering the backcheck (we are not talking about checking height = here we are talking about the height of the backcheck) would give the = hammer a fraction of a second longer to get out of the way. Keith Roberts ----- Original Message -----=20 From: David Love=20 To: Pianotech ; Richard Brekne=20 Sent: Thursday, May 29, 2003 1:08 AM Subject: Re: Backchecking Height and an incredible help My guess is that if the hammer is checking so high that the tail rubs = on the backcheck on the way up (just slightly) it will diminish hammer = speed and the volume will be thus diminished making it seem like it is = the close checking that is the cause. Otherwise, I put this in Carl = Sagan's "Demon Haunted World". David Love davidlovepianos@earthlink.net ----- Original Message -----=20 From: Richard Brekne=20 To: Pianotech Sent: 5/29/2003 12:34:58 AM=20 Subject: Re: Backchecking Height and an incredible help =20 BobDavis88@aol.com wrote:=20 Hafta say I ain't buying this. The excursion of the string is so = slight that I can't believe that an object 1/2" away could cause air to = offer much impedance. I'm willing to bet if I held my thumb 1/2" from = the string right above the strike point, no one could tell me when it = was there and when it wasn't, blindfolded. Cant say I blame you. Does sound a bit fantastic.... to put it = mildly. But next time you run into a grand that has obviously high = checks you can try this out.=20 Take any old note...maybe say A4 :), get a sense for its volume and = compared with its neighbors. Run a few chromatics up and down. Then = lower its back check to exactly 2 mm under the tail at drop and listen = again.=20 See what you think. I dunno, maybe you wont buy it then too. Maybe = its like the proverbial green light at that last millisecond of sunset = at sea..... But I do know what I heard.=20 Sorry I don't have something more positive to offer as an = explanation for optimal checking=3Dlouder tone. I'll be watching this = space anxiously.=20 Bob D RicB=20 --=20 Richard Brekne=20 RPT, N.P.T.F.=20 UiB, Bergen, Norway=20 mailto:rbrekne@broadpark.no=20 http://home.broadpark.no/~rbrekne/ricmain.html=20 http://www.hf.uib.no/grieg/personer/cv_RB.html=20 =20 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/18/76/fc/f9/attachment.htm ---------------------- multipart/alternative attachment--
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