As per the title of the thread. I'm thinking about making a couple of shelves to rest on sorbothane hemispheres for my Quadraspire SVT rack. The rack is great but I'm wondering about the isolation benifits and if sorbothane loses its ability to 'suspend' the weight over time? Has anyone used sorbothane for more than a year or so, and have you noticed that it has completely compressed?

I'm also looking at making plinths for my speakers to use sorbothane between speaker cab and plinth. Good idea? Bad? Or just stupid?