[pianotech] Double Octave Stretch

[David Ilvedson]

That sounds like out of tune to me...

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Mark & Janine Davis" <pianofortetechnology at saol.com>
To: pianotech at ptg.org
Received: 2/5/2010 1:05:18 PM
Subject: [pianotech] Double Octave Stretch


>Greetings List,

>I have read much about piano tuners preferred octave stretch.  I recently
>came across a grand piano in a fairly large school hall which had been tuned
>two weeks prior to me inspecting the piano on request.  The octaves were
>stretched 1 bps and the double octaves were beating almost 7bps.

>Rick Baldassin writes in his book "On Pitch", pg 83.84,85.  'There are
>widely varying opinions as to where and how much to stretch octaves, and
>rather than impose my personal opinions, I choose to present facts and tests
>that will allow each reader to experiment and create his or her own opinions
>as to how and where stretching should be done. After all, in octave
>stretching, what we are dealing with is often more a matter of artistic
>preference in a grey area than random selection in black and white.Remember
>that when stretching the octaves, the demands of the double octaves must
>also be met.'

>My questions are, what are the demands of the double octave and what is the
>maximum stretch one can/does use in a big concert hall, once again
>considering the double octave demand?  In other words how much stretch is to
>much and the reasons why?

>Thank you, Mark Davis 

>