Inharmonicity - so what?

[Jim Coleman, Sr.]

Hi Richard:

The next time you rebuild a Grand, while the strings are off, hit the 
soundboard with a tympani mallet or even your fist. You will hear a resonant
frequency around A1, B1 or C2. A large grand may have a resonant freq. 
as low as F#1 or maybe even lower. My Steinway L has a resonant freq. at B1
with the strings on and up to pitch. When I worked at Baldwin, I would go 
around at night and give a fist test to all the pianos in 1st belly station.
That's where the soundboards have just been glued in. The Concert grands
had lower resonant freqs. than the small M's did. After stringing, the
freq. is a little higher due to the loading and added stiffness.

Jim Coleman, Sr.

 On Thu, 20 Aug 1998, Richard Moody wrote:

> 
> ----------
> > From: Delwin D Fandrich <pianobuilders@olynet.com>
> > To: pianotech@ptg.org
> > Subject: Re: Inharmonicity - so what?
> > Date: Wednesday, August 19, 1998 1:54 AM
> 
> 
> >If the fundamental resonant frequency of the string loaded >soundboard
> assembly 
> 
> How is this freq determined? 
> Ric
> 
>