<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6000.16587" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Many years ago when I worked as a service tech., doing other instruments other than piano, </FONT></DIV> <DIV><FONT face=Arial size=2>I reconed speakers, and did much work on organs, etc.   One day I went to look at a quite large </FONT></DIV> <DIV><FONT face=Arial size=2>Kawai organ in a dealers store. The problem was a lack of punch, or volume. Everything seemed </FONT></DIV> <DIV><FONT face=Arial size=2>normal, but no juice.  After looking at this thing for some time, I noticed that the 2 big speakers had</FONT></DIV> <DIV><FONT face=Arial size=2>the color wires hooked - up backwards. Of course those who are in the know , realise that this put</FONT></DIV> <DIV><FONT face=Arial size=2>the 2 speakers out of faze with each other. One speaker was moving out , while at the same time the </FONT></DIV> <DIV><FONT face=Arial size=2>other was moving in. In effect cancelling each other out , by lessening the amount of air either speaker</FONT></DIV> <DIV><FONT face=Arial size=2>could move.  This was a great example that the movement of the speaker cone produced the air movement</FONT></DIV> <DIV><FONT face=Arial size=2>which produced sound. When I reversed the wires on one speaker, the sound was amplified considerably.</FONT></DIV> <DIV><FONT face=Arial size=2>I think the speaker moved the same amount, so the problem wasn't electrical .   </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Another example is when a string has a false beat, sometimes tuning a string</FONT></DIV> <DIV><FONT face=Arial size=2>in the same triad, will lessen or even cancell out the beat produced by the single.  I assume that what is</FONT></DIV> <DIV><FONT face=Arial size=2>actually happening is that the false beat is flat and the next string tuned will be a little sharp and cancell.</FONT></DIV> <DIV><FONT face=Arial size=2>Not sure this is the reason, but my mind sees it that way. If anyone has a better explantion, I'd sure like to hear it.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Carl / Winnipeg</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV>----- Original Message ----- </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=paul@bruesch.net href="mailto:paul@bruesch.net">paul bruesch</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech List</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, January 25, 2008 9:18 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Questions on sound waves/air blowing/wind</DIV> <DIV><BR></DIV>Wind is an air mass that's moving, at a constant velocity, relative to a stationary body... the planet, you, a building, etc.  Sound is also air that's moving, but it's air that is moving not only relative to stationary bodies, but also relative to itself. A vibration is a molecule of air pushing the molecule ahead of it, but the molecule behind the one that's pushing isn't pushing, or even quite keeping up.<BR><BR>You (or at least I) <I>can</I> feel sound... haven't you ever stood in front of the big woofer speakers at a concert or at the disco<g>?  <BR><BR>I'm sure I'll get clarified or even (likely) corrected, but that's my explanation and I'm sticking to it, at least until I get clarified or corrected...<BR><BR>Paul Bruesch<BR>Stillwater, MN (where it's warming up today... we're already at +4F!)<BR><BR> <DIV class=gmail_quote>On Jan 25, 2008 8:52 AM, <<A href="mailto:KeyKat88@aol.com">KeyKat88@aol.com</A>> wrote:<BR> <BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid"> <DIV style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: rgb(255,255,255)"> <DIV>Greeetings,</DIV> <DIV> </DIV> <DIV>          This may sound elementary but, if sound waves are compressed and rarefacted molecules of air, then how is it that soundwaves are not wind, or air blowing...why can't you <I><U>feel</U></I> sound waves moving past your ear? ...(or <I><U>can</U></I> you feel them if the sound is loud enough?) This may sound crazy but, shouldn't a high note such as C88 make you feel colder  because its 4160cps of comp and raref's going past your body as compared with A0 at 27cps? Why arent sound waves enough to <I>move</I> air?</DIV> <DIV> </DIV> <DIV>This question has plagued me for a long long time.</DIV> <DIV> </DIV> <DIV>Thanks,</DIV> <DIV>Julia</DIV> <DIV>Reading, PA</DIV> <DIV> </DIV> <DIV> </DIV> <DIV> </DIV> <DIV>          </DIV><BR><BR><BR> <DIV><FONT style="FONT: 10pt ARIAL,SAN-SERIF; COLOR: black; font-size-adjust: none; font-stretch: normal"> <HR style="MARGIN-TOP: 10px"> Who's never won? <A title=http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp00300000002548 href="http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp00300000002548" target=_blank>Biggest Grammy Award surprises of all time on AOL Music.</A></FONT></DIV></DIV></BLOCKQUOTE></DIV><BR></BLOCKQUOTE></BODY></HTML>