Hi Bill, The problem is that piano strings are coupled so a *good* solid unison I.e. that is *beat free* at all *audible* partials is more or less impossible to tune aurally. Yes, you could used a tenth (or a 17th) and *match* the beating. But if you do the unison will simply not sound *clean*. I believe this is where the 1/2 cent is that you are chasing with the ETD. I was hoping that you would have *proof* i.e. specific measurements made under super conditions to offer me. At 02:10 PM 1/29/98 EST, you wrote: >In a message dated 98-01-29 12:55:29 EST, you write: > ><< This is very interesting! > > > It has been well demonstrated that a > >properly tuned unison will read about 1/2 cent flat of a single string. >This > >presents a problem both in aural and electronic tuning. > > Who has demonstrated this and how? There has been some discussion of this > before on the list. But only Jim Coleman has *posted* his results. I had > hoped that another technician would try to duplicate his results! > There may be some out there who claim it is even more >but that is my estimation. I'm also not sure if it is a constant amount or >one that varies. It would be an interesting but time-consuming and difficult >study to do. > >It is one of the effects of the "coupled motion of strings". I think of it as >something like the "Doppler effect". It is a very real phenomenon. It is >important to be aware of and to compensate for in truly fine tuning. > >Bill Bremmer RPT >Madison, Wisconsin > > Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. "Tuner for the Centre of the Arts" drose@dlcwest.com 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
This PTG archive page provided courtesy of Moy Piano Service, LLC