Isolation in the purist term does not exsist, so why waste your time. Speaking of time,everything moves and vibrates. These artificially induced motions create their own current of noise which are regurgitated, and again misproduced by your equipment, over and over again. Look to the Coloumb law of physics. Yes you can damp it down and move it around and change its sound, but it never left town.{ Damn I couldn"t resist the rhyme.} Its still trapped and reaping havoc on your system. If you want to give it a ticket to ride, check out the Sistrum platforms. They work. I have been using them for three years now. And all is better.
What is vibration isolation for?
Where do these vibrations come from? From where I stand the earth doesn't shake too badly?! I would think that most vibrations would come via sound transmission through the air directly through the chassis of the components thus rendering the racks or other vibration isolation, uh, useless, no? (with the exception of actual thumping from walking etc)