Originally Posted by Patrick Bateman View Post

But there's another approach that works too, which is to have a stiff layer, then a soft layer, and then a stiff layer. What happens is that the stiff layer flexes, and the soft layer absorbs the energy.

This is constrained layer damping, and with this approach you can create a material that is better damped than lead.(!)
Does anyone here remember Dynaboard? It was two layers of wood with a layer of deadener in between. It seems as tho it might come under this heading (constrained layer damping), and might be quite effective. I've never used it, and it seems to be no longer available, but I was wondering if anyone else had used it and what were the results?