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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=collin.s@skynet.be =
href="mailto:collin.s@skynet.be">Stéphane
Collin</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> February 10, 2002 2:25 =
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Soundboard springs =
and
hysterisis: question for Del F.</DIV>
<DIV><BR></DIV>
<DIV><FONT face="Times New Roman" size=2>Hi, list.</FONT></DIV>
<DIV><FONT face="Times New Roman" size=2></FONT> </DIV>
<DIV><FONT face="Times New Roman" size=2>I don't know if this is =
relevant, but
I would like to share this experience with list. I have a =
wonderful old
Bechstein grand 7 ft 8 in from 1877, with a real great acoustic =
potential, in
my opinion. I am now voicing it to the best I can. I =
strugled with
a kind of agressiveness problem, trying to localise where I had to =
needle in
the hammers to get it right. For some reason, I took out of the =
piano
the damp chaser system it had, and this appeard to solve my =
problem. In
fact, the system was installed high in between the wooden frame =
blocks, and
the plastic cover of the system was slightly pushing against the
soundboard. This appeard clearly to dampen the fundamentals of =
all
notes, giving the feel of less sustained and more agressive
sound.</FONT></DIV>
<DIV><FONT face="Times New Roman" size=2></FONT> </DIV>
<DIV><FONT face="Times New Roman" size=2>Wouldn't you expect a =
soundboard
spring to cause the same kind of sound problem ?</FONT></DIV>
<DIV><FONT face="Times New Roman" size=2></FONT> </DIV>
<DIV><FONT face="Times New Roman" size=2>Stéphane =
Collin</FONT></DIV>
<DIV><FONT face="Times New Roman" size=2>Bruxelles, =
Belgium</FONT></DIV>
<DIV><FONT face="Times New Roman" =
size=2></FONT> </DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Times New Roman" =
size=2></FONT> </DIV>
<DIV dir=ltr><FONT color=#000080 size=2>Keep in mind there is =
little actual
experience with this idea--some limiited experimental work by a very few =
technicians (and that many years ago)--but this did not seem to be a =
problem.
</FONT></DIV>
<DIV dir=ltr><FONT color=#000080 size=2></FONT> </DIV>
<DIV dir=ltr><FONT color=#000080 size=2>In theory the added spring =
pressure
increases the mechanical impedance of the soundboard system to the lower =
frequencies (predominatly) which should improve (or restore) low =
frequency, or
fundamental, sustain.</FONT></DIV>
<DIV dir=ltr><FONT color=#000080 size=2></FONT> </DIV>
<DIV dir=ltr><FONT color=#000080 =
size=2>Del</FONT></DIV></BODY></HTML>