RC vs CC again (was Re: compression ridges)

[Cy Shuster]

Robin,

Just trying to understand here -- are you saying that "killer octave"
problems can be caused by action problems as well as soundboard
characteristics?  Is there a mechanism by which octaves 5 or 6 would have
more action problems than other octaves?  (More wear from play, perhaps?)

--Cy Shuster--
Rochester, MN

----- Original Message ----- 
From: "Robin Hufford" <hufford1@airmail.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Monday, September 29, 2003 3:02 AM
Subject: Re: RC vs CC again (was Re: compression ridges)


>      In my opinion, the so-called killer octave is exaggerated as a
> generalized fault of most of these instruments when brought up here on
> the list and there is a particular reason for this.

  <snip>

>       I believe an analysis of this expressed years ago in the Journal
> of problems here being a function of the hammer line and elastic
> characteristics of the hammer assembly ( this is also a large subject),
> and striking point versus traveling wave speed on the string,  is at
> least as important as is  it being considered a function of soundboard
> characteristics and a measure of board failure.  There are a large
> number of factors that, when optimal,  avoid loss in energy delivery
> ultimately to the board, as, of course, you know, and which contribute
> to the sound produced.  Collectively, they are absolutely critical.
> For example, tight bridge pins, hammer centers, jack centers, string
> levelling, hammer angle, terminations efficiency,  and others all of
> which are frequently examined here.