>That's it, thanks. Of what purpose is the soundboard cutoff bar? To shorten the ribs, for better stiffness control, and to eliminate an unneeded area of the board for a better progression of diaphragm response through the scale. Without the cutoff, there's too much soundboard for the frequencies there, which produces conflicting resonance modes rather than working as a unit. >I presume from the name that it attaches to the underside of the soundboard? Yes, and to the beams underneath. It redefines and becomes the rim for the soundboard. >If so, in what manner is it attached and is it crowned to match the >curvature of the board at that point? > >David Love It's glued and doweled, no crown - flat. The board doesn't mind. Ron N
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