<html> <body> 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: <blockquote type=cite class=cite cite="">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@comcast.net <a href="http://www.davidlovepianos.com/" eudora="autourl"> www.davidlovepianos.com</a> -----Original Message----- From: pianotech-bounces@ptg.org [<a href="mailto:pianotech-bounces@ptg.org" eudora="autourl"> mailto:pianotech-bounces@ptg.org</a>] On Behalf Of Erwinspiano@aol.com Sent: Wednesday, November 14, 2007 7:31 AM To: pianotech@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?  <dl> <dd>David Love <dd>davidlovepianos@comcast.net <dd><a href="http://www.davidlovepianos.com/" eudora="autourl"> www.davidlovepianos.com</a> <dd>-----Original Message </dl>  <hr> <div align="center"></div> See what's new at <a href="http://www.aol.com?NCID=AOLCMP00300000001170">AOL.com</a> and <a href="http://www.aol.com/mksplash.adp?NCID=AOLCMP00300000001169">Make AOL Your Homepage</a>.</blockquote></body> </html>