HI Dale < In the case cited the piano in question was an Stwy A-2 and having done quite a few A-2s both ways... Right. This is where the complexity of the system in general and each individual belly comes into play. I can see a reasoning why the sound might be a little different between the single and double crown, but I really don't think I would attribute it the 3 dimensionality of the system as Nick is suggesting. Rather I could see it as distributing the tail "bend down" in a more evenly trended fashion across more of the long bridge rather than localized at just the tail. I used to attribute more stiffness to the shape of the crown itself. But after watching these things behave in and out of the piano the crown shape in and of itself, at least in a minimally compressed rib crowned board, really does not seem to be doing much in and of itself. As I say, this was not my opinion originally but it certainly is where I'm going right now..at least until suppertime<G>. However, to be clear my opinion is being formed regarding the RC&C structure in particular, not a compression system. One difficulty in this discussion is that Nick is (correct me if I'm wrong, Nick) talking about a CC system, and I am talking about a Rib crowned system. I think Dale may be referring to a hybrid system. If we talk of 3 different structural systems as if they are the same structural system, thing get mushy...an apples and oranges thing. Jim Ialeggio -- Jim Ialeggio jim at grandpianosolutions.com 978 425-9026 Shirley Center, MA
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