evaluating sdbd. crown & bridge downbearings in a new piano

[Richard Moody]

----------
> From: Delwin D Fandrich <pianobuilders@olynet.com>
> To: pianotech@ptg.org
> Subject: Re: evaluating sdbd. crown & bridge downbearings in a new piano
> Date: Thursday, September 23, 1999 9:37 AM
> 
> 
> 
> Bent wood does not "amplify" sound.  Piano soundboards do not "amplify"
> sound.  Piano soundboards do not amplify anything.  Ever.  Under any
> circumstances.  They are not amplifiers.  They do not add any energy to the
> sound.  They are simply transducers in the sense that they change energy
> from one form to another.

Whatever word is "correct" the fork seemed "louder" with the bent wood.
> 
> The demonstration model using the tuning fork proves only that you can tune
> the resonant frequency of a wood assembly by altering its stiffness.  And
> that that particular soundboard operates very efficiently as a transducer
> when its natural resonant frequency is tuned to the specific frequency of
> the tuning fork. 

Shucks! I would be glad to put it to the  test you suggest, but I don't have that
demonstration model, or I would put a diff freq fork on it. Or one of those forks
with sliding weights or glue on a loud speaker (little one) and hook it up to
Tunelab and test every frequency..   
 



  >Otherwise resonances within the soundboard panel can
> only be considered to be voicing problems.
> 


Sorry, this doesn't make sense. Voicing changes frequency? Hammer voicing?  Or is
there a  voicing procedure for soundboards? ---ric