I have found there is no other way to approach mechanical isolation other than to try different products. It is not simply a matter of finding something that gives you the MOST isolation or dampening. Sometimes less is more desirable. I've heard systems sound worse when a particular component is dampened. It is a matter of voicing, and that can only be done by trial and error. In particular, CD players can become too dry and analytical sounding -- I suspect that good designers actually voice their products and dampening can alter the voicing for the worse.
