S&S D Duplex

[Isaac OLEG]

Hello, David,

Assuming it is not sounding too much after that...
Duplex noise is one thing, if it become a real note it would be not
acceptable I guess. if we add too much length at the duplex it may
ring.

Beside, in regard of the spectra enlargement due to inharmonicity, I
doubt that duplexes can be tuned accurately by computation.
And as we probably aim for an evenness of tension on the 2 sides of
the bridge, I see an impossibility there, or a very hard task.

When tuning, there is a point where the system is more responsive, and
I believe that is when the tension (or the pressure) have evened. No
real backup on this one, are some facts known about it ?

I like to know what it made in regard of the phase coupling, but I
suggest that the evenness of tension, or the evenness of pressure on
the 2 sides of the bridge give it more freeness to respond to string
solicitation.

Best regards.

Isaac OLEG




> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de David Love
> Envoyé : mardi 19 novembre 2002 15:50
> À : Pianotech
> Objet : Re: S&S D Duplex
>
>
> Quick question about this duplex thing.  Let's just say for
> arguments sake
> that you didn't think that tuning the duplex is important,
> necessary, or
> even desirable.  Then, on a Steinway, would the best
> position for the rear
> duplex aliquots (bearing considerations aside) be that
> which gives the
> greatest backscale length?  In other words, would you push
> the aliquots back
> as far as possible and grind them down accordingly to give
> the proper
> downbearing setting?
>
> David Love
>
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
>