Question About Setting Octaves in the High Treble

[Ric Brekne]

Hi John

Yes, I noticed that when I read your innlegg earlier this week.  Jason 
Kanter is on along the same lines.  This stretch is all about finding a 
balance between the 4:1, 3:1, and 2:1 partials.  You dont really take 
any direct regard to the 4:2 at all. That falls nicely into place on its 
own when using the 12th as an anchour thus.  Funny thing about this is 
that it seems to give the effect of  having a greater stretch then it 
actually does. Dr. Coleman commented on this a couple years back.  He 
observed that holding 12ths perfect in the tenor/treble areas result in 
the area around F4-C5 being stretched a tad more then octave priority 
tuning tests yeild, while maintaining a moderate high treble stretch.  
I've never really taken the time to compare stretch numbers thus.  The 
top treble tho nearly never results in a C8 that is offset more then 
32-36 cents.  Triple octave tuners often push 45 cents, and the 
gorrillas our good friend David Andresen refers too sometimes are way 
over 60 cents high.

Cheers
RicB

John Formsma wrote:

>Ric,
>
><<Listening to beat rates,  the 17th is to be tuned so that it is slightly
>faster then the 3rd, even less so but still faster then the 10th, and just
>barely slower  (under 0.5 bps) then the 6th.   The 6th / 17th is a test for
>a 12th below the 17th
>
>Playing the intervals in fairly quick order as given above, it is very easy
>to hear the relative beat rates and place the note to be tuned (the 17th)
>inbetween. Followed up by close listening to double and singel octaves and
>the 12th, you quickly get a very consistantly and crispy clean treble all
>the way up.>> 
>
>Sounds similar to the results I get for using the double octave (15) and
>octave-fifth (12th). If you make them beat equally, you get what you
>described in your post. Almost pure 12ths, and double octaves about 1/2 bps
>or less depending on the piano. Done all the way to the top produces a sound
>that is just right, IMHO, of course! ;-)
>
>John Formsma
>
>
>  
>