<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.6000.16481" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#d8d0c8> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080>If the problem is with the higher partials ringing through in the bass section, added mass will probably help. </FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080>The springs need to be strong enough to firmly seat the damper heads against the strings. </FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080>There needs to be some (not a huge amount, but some) follow-through when you press against the strings.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080>The damper wedges need to be reasonably well spaced and matched to the strings.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080>Del</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007> <P><FONT size=2>Delwin D Fandrich<BR>Piano Design & Manufacturing Consultant<BR>620 South Tower Avenue<BR>Centralia, Washington 98531  USA<BR>Phone  360.736-7563<BR><<A href="mailto:fandrich@pianobuilders.com">mailto:fandrich@pianobuilders.com</A>> </FONT></P></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=930325018-05072007><FONT face="Comic Sans MS" color=#000080></FONT></SPAN> </DIV><BR> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left> <HR tabIndex=-1> <FONT face=Tahoma size=2><B>From:</B> pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On Behalf Of </B>Cy Shuster<BR><B>Sent:</B> July 01, 2007 6:26 AM<BR><B>To:</B> Pianotech List<BR><B>Subject:</B> Re: Damper felt replacement<BR></FONT><BR></DIV> <DIV></DIV> <DIV><FONT size=2>It's impedance matching.  Mass helps the bass strings better; springs help the treble better (if I remember right).</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>--Cy--</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=madvinmryk@yahoo.com href="mailto:madvinmryk@yahoo.com">vince mrykalo</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> Saturday, June 30, 2007 11:49 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Damper felt replacement</DIV> <DIV><BR></DIV>Let's see, the spring action dampens the fundamental more, and mass affects the dampening of the partials...or is it the other way around...no, i think i was right the first time.  Right?<BR></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>