Sound waves(The behavior of soundboards)

Richard Brekne Richard.Brekne@grieg.uib.no
Fri, 21 Dec 2001 18:20:20 +0100


Ron Nossaman wrote:

> This still leaves the perpetually unanswered question of how minute a bridge
> movement is no
> movement at all. I had presumed that your post immediately following this
> one would clear that up for me and put this increasingly tedious exercise
> to rest, but it hasn't happened. I would like an answer to this please,
> since it is the basis of your stand in this discussion.
>
> Ron N

I fail to see that the point about << how small a movement has to become for it
to not exist >> has any such fundamental basis for Johns perspective. And I am
not quite sure his meaning was not more in the direction of meaningless instead
of non existent to begin with.. Or perhaps you, in reverting to your mosquito
example, would like to discuss the net effect of the insects' impact on the
airliner ?

Actually, it seems to me that JD presents some pretty sensible argumentation
that points in the direction of the bridge and sound board working more in
concert with each other as a complete and unified assembly to create the
eventual pressure waves we actually hear as sound. The model of the bridge
acting as some kind of shaker doesn't seem to take into consideration the
question of internal pressure waves, and I fail to see that any of you have even
come close to addressing that issue beyond expressing some apparent amusement at
the notion, much less refuting it.

JD, I thought your last post on this subject matter was most interesting, and I
look forward to some truly relevant critic from the other camp.

One thing though.... I am not really sure just how important this all is for the
actual process of building an instrument. What kind of design issues could be
affected by considering this matter one way or the other ?

RicB



--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no




This PTG archive page provided courtesy of Moy Piano Service, LLC