[>>>" I asked in another thread about wood under components to eliminate vibration etc" <<<]
I don't think you can totally eliminate vibration, the best you can hope to do is shift them out of the audible range, where they will do less harm.
Vibration attack your system from 3 different fronts ... (1) Equipment Generated, (2) Air Born and (3) Floor Born ... each will require a different strategy and method of approach
Equipment Generated should be drained away into a higher mass shelf. Believe it or not, this is one of the purposes of the stock feet on our equipment, but we have come to realize that there are better alternatives (cones, wood blocks, roller bearings etc etc.)
Air Born, these are vibes that are generated by your speakers. Have you ever sat in a friend's Home Theater, and had your pant leg flap around when the SUB fired off. Your equipment senses this also. The defense here is to MASS LOAD (add weight to each component)
Floor Born ... this is the one that makes the guy's with the Turn Tables crazy ... can you say foot falls. Your rack will conduct various forms of vibration from the cars and trucks passing you house, HVAC system under thier normal operation, and even the natural Geo-Seismic shudder of Mother Earth. Against these infiltraters you must Decouple.
What I hope you get out of my post is there is no one device that can cure all forms of vibration.
Vibration Control can be harder than Chinese Arithmetic (and I mean no disrespect to our fine Pacific Rim members)
Make a plan ... plan your work ... and work your plan