Stein grand unique board

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: Erwinspiano@AOL.COM=20
  To: pianotech@ptg.org=20
  Sent: January 06, 2002 3:24 PM
  Subject: Re: Stein grand unique board


  In a message dated 1/4/2002 1:54:17 PM Pacific Standard Time, =
JIMRPT@AOL.COM writes:=20



    Subj:Re: Stein grand unique board=20
    Date:1/4/2002 1:54:17 PM Pacific Standard Time=20
    From:    JIMRPT@AOL.COM=20
    Sender:    owner-pianotech@ptg.org=20
    Reply-to: pianotech@ptg.org=20
    To:    pianotech@ptg.org=20

       Hi Jim ,Phil and list

        =20
        I would have jumped in sooner but have been gone. I was hoping =
this would generate this kind of discussion=20
        I have no argument with the the physical law stated below but =
let me suggest for the sake of discussion that the primary energy source =
being considered in the pond analogy, the pebble tossed in, is the =
initiator of the waves action. The primal energy source. In the =
soundboard system the traveling wave set into motion by the hammer is =
the primal energy source and as long as the string vibrates the waves =
continue to radiate out from the primary energy source and dissipate =
into whatever by absorbtion,friction,heat or moving air.=20
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I'll point out once again that the pond analogy is not a very good one. =
These are surface waves while the motion of the soundboard--at least the =
motion that is creating sound energy is quite different. The system is =
vibrating as a unified whole.



    Perhaps Phil Ford and  Charles Fredrick Stein  has a valid point =
that we should consider the reflective wave as of lesser importance, =
though not unimportant, when designing a soundboard system, apparently =
Charles did.=20
        As Del has said the soundboard system functions as system and =
what we seem to be doing here is  consider the various individual =
component aspects as to there contribution to sound production as a =
system. Seems to me like a healthy thing for a think tank to do.=20
As long as there is any vibrations felt in the rim there are associated =
energy losses from the soundboard. Whether you view this as energy not =
reflected back into the soundboard or as energy losses from the =
soundboard to a less than perfectly massive and rigid rim is =
irrelevent--it is still reducing the sustain time of the system.=20



     Another thought that occurs to me is, that however the listener =
would describe the overall sound of the Stein system, that sound will =
have to be partially  ascribed to the lack of reflected energy from the =
rim on the straight side and curved side of the rim even though we can't =
dissect or isolate it. Alas another mystery.=20
How would you describe the function of those relatively thick ribs =
that--unless I completely mis-read your discription of them--remain =
solidly glued to the inner rim?


         Also perhaps the fact that all the end grain of the soundboard =
panel is terminated at the belly rail, which as Del pointed out, adds =
all the stiffness the trebles require to function. Afterall sound =
travels along the grain faster than across. My deduction from all this =
is that the tail end of the piano is not as drastically compromised by =
having a pseudo free floating edge around the majority of its perimeter. =

And I would suggest that this is not even close to being a pseudo =
free-floating soundboard system. Free-floating means free-floating as in =
not attached to the rim in any way. And those ribs being glued to the =
inner rim are not at all free-floating. Nor is the soundboard system as =
long as the soundboard panel remains glued to those ribs.=20

Del



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