Someone mentioned Bosies in the last bit of the discussion. It would be nice to hear a short followup from ya'll on how these evident exceptions to the rule with their comparitively soft rims seem to yield such nice results. Seems like there are more ways then one to approach the rim impedance question. Cheers RicB -------------------- > Now, the impedance under consideration is the ability to resist energy from > the board into the rim where it's dissipated, if I'm getting it. So, more > mass = more impedance = more sustain, huh? Impedance is a combination of mass and stiffness. In the soundboard, the optimal proportion is frequency dependent. In the rim, whatever it takes to minimize energy transfer is what you want. Stiffness is important, but I've come to suspect that mass is the major player once a minimum threshold stiffness is met. If rim impedance is high enough that it's not unnecessarily absorbing soundboard energy, sustain will be longer than in assemblies where the rim is unnecessarily absorbing soundboard energy. This one's graded on the curve.
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