Hi Dean. I would think you are right in thinking you two are kind of talking past each other. I would advise from personal experience to not press through trying to get things straight.... because this seems to just cause increased miscommunication. And in the end unnecessary harsh words can be thrown out in irritation or frustration... depending on which side of the discussion you are on. Leave it and think it over, then come back at it later. Of course the panel needs to be a minimum degree of stiff everywhere. That said... the opposite can be said as well.... i.e. it can be too stiff. The same can be said about the amount of mass in any given area of the piano. The key issue is --- what ratio of one to the other is needed in each place. But you WERE correct in understanding from Del's class that in the bass stiffness is the critical moment and in the treble mass levels the critical moment. But that is not the same as saying you need more stiffness and less mass in the bass (and the opposite in the treble). It just means that once minimum levels of each are established, manipulating mass in the treble gives you more bang for your buck, and manipulating stiffness in the bass gives more bang for the buck down there. Cheers RicB I don't get it, Ron. Are we just not communicating? What is it I need to give up? I think we both are agreeing the perimeter needs to be flexible and you yourself stated that the main part of the panel will be inherently rigid. You even agree that the cone on a subwoofer must be stiff/rigid. Dean
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