[CAUT] Accujust and grunting fish bait

[David Love]

The energy from the string which doesn't have enough mass to move very much
air is transferred to the soundboard which does.  So the increased volume of
sound is because the soundboard, whose total energy output is less than what
the string started with, is more efficient at moving more air even with less
energy.  It's not really amplified in the same what that, say, an electric
guitar is amplified.  But the soundboard does make the vibrating string
louder, just not amplified.  Terminology issue.  The vocal cord thing and
creating an area in the throat that produces some resonance is something
slightly different again.

But on the hitch pin thing, if you think that the height of the hitch pin is
influencing some kind of plate resonance why don't you try tapping down the
hitch pin in question (or the string height off the plate on that particular
pin) and see if it changes.  Some plates are heavier and/or less prone to
resonances than others and it seems that the way a vertical hitch pin (or a
group of them) stresses one plate might be different than it stresses
another.  In the same way that you can make a piece of spruce a more
effective "resonator" by bending it slightly the same effect might be
possible on a certain type of plate that is stressed or bent by the strings
bearing on vertical hitches.  There is no question but that a vertical hitch
puts a different type of stress on the plate than the normal type of hitch
does and the higher the hitch is off the plate, the greater the stress.
While I have not had resonance problems with the plates I've installed
vertical hitches on (Steinway, MH, Knabe) that is not to say that a
resonance might not develop on some type of plate due to the addition of
vertical hitches.  Or so it seems to me.  So it seems like the only thing to
do, if you are convinced that is the problem, is to change the stresses.
That could be done by changing the plate elevation and then the string
height on the vertical hitch to keep the bearing the same or maybe there's
another way.  Too late in the evening to think about it now though.  


David Love
www.davidlovepianos.com

-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Jeff
Tanner
Sent: Thursday, May 07, 2009 9:41 PM
To: caut at ptg.org
Subject: Re: [CAUT] Accujust and grunting fish bait


----- Original Message ----- 
From: "Ron Nossaman" <rnossaman at cox.net>
> No, it doesn't. It transduces, at a net loss. The energy output is less 
> than the input, the difference being absorbed by the system. If there were

> such a thing as a free amplifier, you could daisy chain the things and run

> the world on a flashlight battery. Look up James Maxwell.
> Ron N

You knew what I meant. Since I'm not a physicist, I consider this a 
semantics difference. What I meant by amplify is some device that increases 
volume of sound.  I can do the same thing with my voice.  Same energy on the

vocal chords, but properly placed in the resonance, the volume and 
projection are increased.

(which would mean a lower energy requirement to produce the same volume?)
Jeff