Impedance Problem

[Richard Brekne]

Hi Dave

I assume we are still talking about the vise grips on the back bridge 
pin absorbing quite a bit of sound for that loud note... but doesnt 
effect the neighboring notes.

I'd like to know whether you tried moving the grips to each adjacent 
note and observing the behaviour of these same notes

Impedance problems per definition a related to resonant frequencies, and 
their nodes and anti nodes in the soundboard. If you are right on a 
node, any input frequencies that correspond to that node frequency will 
get sucked up more or less.  On the other hand...if you are right at the 
antinode for a resonant frequency and input that frequency... its going 
to be readily resonated.

This is all better described in the 5 Lectures.

Cheers
RicB

>
>I think there are two issues.  One is impedance matching (or lack of)
>between the low end of the tenor bridge and the top end of the bass
>bridge.  The other issue is resonant frequencies when there is a
>sympathetic match between a certain note and a section of the soundboard
>that it excites.
>
>David Love
>davidlovepianos@comcast.net 
>
>  
>