I think I've got the gist of Mr Margolis's explanation some of which makes sense and some of which (to use an Americanism) is pure baloney. He seems to have wrongly understood the principle of conservation of energy and has interpreted its meaning as an ability to hold on to or 'conserve' energy in one form. This is wrong and if it were the case for Superballs they wouldn't bounce at all! Superballs are particularly good at turning kinetic energy into potential energy with less elastic losses of a conventional rubber ball. That's why the buggers bounce so high! Whether this property could be used to good effect under a loudspeaker (as the Margolis theory goes) to reflect energy “against itself†thereby causing phase cancellation is interesting but a little wobbly. Certainly underneath a CDP or any other vibration sensitive component it's a bad idea.