[CAUT] killer octave resonator

[Richard Brekne]

Hi Chris

I am reasonably comfortable with how it does what it is supposed to 
do.... at least I think I am... I just dont see how it can substantially 
cure an already acute killer octave situation... and I am not sure I see 
how it prevents one.

The reason for this lack of understanding on my part is because I have 
interpreted the <<killer octave syndrom>> to be equivalent with a 
failure of the soundboard rib assembly to support downbearing at the 
effected area.  So it seems to me that a strong enough support directly 
under the bridge at this area is what would be needed to prevent that.  
I dont see how increasing the stiffness of the belly rail provides that.

Misunderstand me not.... I am not saying anything along the lines of << 
I'm not a believer >>... I just wish someone would go into detail to 
explain the relationship between a stiffer belly rail and how this 
lessens the likelihood or degree of a case of killer octave syndrom. 

Perhaps my understanding of what a killer octave is to begin with needs 
correcting..... ?

As I believe I am probably not alone in a bit of head scratching 
here.... I think it would be benificial for those who have some insights 
into this to expound a bit on the whole matter.... both exactly what the 
killer octave really is, its causes etc etc etc... and how a stiffer 
belly rail relates to it.

Thanks.

btw... I have one of these devices... and just havent gotten so far as 
to installing it on an appropriate instrument.

Cheers
RicB


    RicB,
     I can't explain why the resonator works any more than I have. Read
    Bob Grijalva's article in a recent PTG Journal or the instructions
    that come with the device, from Pianotek. I will offer, however,
    that it works PDG and if you try one one you will know that too,
    even if you never fully explain it.
    Perhaps a quote from the instructions by Bob G could help,
     "The challenge in desgining the Treble Resonator was enabling a
    connection between the rim and belly rail that did not interfere
    with the vertical bolt that extends to the plate from the treble
    bell. As mentioned earlier (in PTG article), this vertical bolt is
    the very reason why pianos of this type do not have a wooden beam at
    that juncture, leaving a lengthy section of the belly rail unsupported."
    "I also wanted the adjustment to be mechanically intuitive. The
    Treble Resonator works by pulling the rim and belly toward each
    other through contraction of the trunbuckle, rather than expansion,
    as in the Falcone jack design. One should rotate the tunbuckle in a
    clockwise manner in relation to the plate that is attached to the
    belly rail. This contraction works to reinforce and integrate the
    entire system, possibly providing linkage betweeen the belly and the
    rim, enabling them to expand and contract in tandem through seasonal
    changes, rather than going their own separate ways."
    Sorry for so little science,
    Chris Solliday  

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20070521/fb272b1d/attachment.html