"Stiffness is desired in the high treble but what about the bass where flexibility seems to rule? " According to Del (and I believe it) high mass and high flexibility isdesired for treble. High stiffness and low mass is desired for bass. Low bass frequencies require a very rigid moving panel. If the panel is not rigid it absorbs all the energy before pumping out the fundamental frequency. Dean Er... I believe you have it backwards Dean. Cheers RicB
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