negativ curved soundboard

[Richard Brekne]

Hey Danny ! 

Hows ya doing down there ? Long time no see.  As for your problem 
piano... I wouldn't accept the thing. If they sold it rebuilt for 15 
grand then things should be done right. I've heard several mixed reports 
from techs about SAP... seems to me that such places need to be kept on 
their toes.  As for how negative crown affects sound and why... it kind 
of depends on the causes of negative crown.  A board meant to have a 
positive spring in and an upwards crown crushed beyond flat and boinged 
inside out is probably not going to develop along positive lines 
acoustically me thinks...

Cheers
RicB


    Custommer wants me to write an expertise on grandpiano Kawai GS80
    2.40 meter ° 1980 bought in a pianoshop in 2005 The piano was
    renovated at SAP in Poland. The duplex bridges where not installed
    correctly: they started at the left and end up with one string left
    without, unisons don't fit on the same duplex,  anyway this is
    already a main reason to complain. Some comments on this
    duplexproblem  related to tuningstability are welcome.

    The soundboard is negativ crowned. I think: soundboard originlly
    dried for Japanese market, in renovation at SAP Poland extrmely
    dried out, restrung with to much downbearing and finally collapsed
    negativ, any other thoughts about why a soundboards becomes negativ
    crowned? Custommer payed 15.000 EUR for this instrument, Should he
    accept the fact of negativ crown? Will the board get even more
    negativ figures in the future? Any experience how negativ crown
    influences the sound and why?

    Be happy to get a lot of comment on this issue,

    Greetings from Belgium
    Danny boddin

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