The Duplex affect --an experiment

[Andrew and Rebeca Anderson]

David,
I work on a D that has its rear sequence on C8 in tune with the tuned 
C8, it has a powerful note there compared to another D that has it 
tuned a tone sharp (no it won't stick when I tune it down and then 
tune the speaking length up).  That sound is just ugly.  It is quite 
discernable to my ear.

One small example at the extreme end of the scale... which might not 
as readily apply elsewhere as the tunings are usually fuzzily 
"in-tune" partials.

Andrew Anderson


At 11:48 AM 11/14/2007, you wrote:
>One thing to try is whether the effect is relatively equal on 
>duplexes which are tuned versus those which are not.  My experience 
>suggests that the effect of a tuned rear duplex is not discernable 
>from an untuned one, though I know that some disagree with that.  My 
>take on that is that the shear number of open segments through the 
>section inclines any number of them to move sympathetically at 
>various intervals such that a fine tuning of them doesn't really 
>reap any additional benefit.   But this is a very difficult thing to 
>test with any real controls and way of measuring the results.
>
>
>David Love
>davidlovepianos at comcast.net
>www.davidlovepianos.com
>-----Original Message-----
>From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] 
>On Behalf Of Erwinspiano at aol.com
>Sent: Wednesday, November 14, 2007 7:31 AM
>To: pianotech at ptg.org
>Subject: Re: The Duplex affect --an experiment
>
>   Hi David
>   Yes we did pluck most all the notes starting in the speaking 
> lengths & then the rear length.  The tuning  was quite good. No 
> doubt the closer it's tuned the greater the affect but our 
> discussion was not advocatiing any attempts to tune them more 
> closely rather it was the opposite which would be to ....  Leave 
> them be & they'll find there own level.
>  Dale
>
>
>. duplex or backscale area is an area that can and does respond 
>sympathetically.   The question of whether it's important that it's 
>tuned or not is another matter.  Did you happen to test whether or 
>not they were tuned?
>
>David Love
>davidlovepianos at comcast.net
>www.davidlovepianos.com
>-----Original Message
>
>
>
>
>
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