[pianotech] The Db1 theory

[erwinspiano at aol.com]

Stephane
 ..And we maybe the only trivial pursuers? Fun never the less
  Dale


-----Original Message-----
From: Stéphane Collin <collin.s at mobistar.be>
To: pianotech at ptg.org
Sent: Sat, Nov 14, 2009 11:27 am
Subject: Re: [pianotech] The Db1 theory




Dale,
 
Now this is a good post.
 
Thanks.
 
Stéphane Collin.
 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of erwinspiano at aol.com
Sent: samedi 14 novembre 2009 19:49
To: pianotech at ptg.org
Subject: Re: [pianotech] The Db1 theory

 

Hi Stephane


 All this is interesting musing for us trivial pursuers but...  I often noted which natural resonance /frequency an un unloaded soundboard gives off when giving it the boom test. (pounding on it with a fist.) Oh & by the way your soundboard must be elevated off the cement floor on blocks, otherwise the energy goes down thru the legs aaaaaaaaaaand, is absorbed into the concrete.) 


  Anyway, I think its like Bb-2 but it vary's slightly depending on the size of board. If the same boom test is given say after the top half of the piano is strung the frequency rises as the board compresses.


  What this has to do with any thing but trivial observations...I don't know, but maybe there is something that coincides with your theory. I'll check on this for fun on the next restring, which is a CC Mason & Hamlin Concert grand from 1975. I'll see if the frequency of the unstrung board may rise to Db. WHo knows. I'll string the enire trebles & bring it up to pitch  before Trix applies the bass strings.


  I find that the Stwy D and other concert grands have 2 modes of boom ... a low frequency in the bottom & another higher one located when pounding higher up.


 In general... The healthier the boom,ie longer the sustained tone, the livelier the board


  Dale






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