Nrchy mentions isolation and dampening, which obviously is not the vibration handling methodology TimUnder is talking about.
Isolation and dampening is but one methodology of dealing with air-borne vibrations and resonance and in my opinion does not work.
The other more modern vibration handling methodology is the 'mechanical transfer to ground of air-borne vibrations and resonance.'
The isolation and dampening method, though might seem logical, is simply an impossible task. You can alter a system's sonics by executing this method, but rarely is it for the better.
The mechanical transfer to ground methodology, when done right, will transfer the air-borne vibrations and resonance away from the components and away from the racking system, via a one-way street (such as Star Sound's Audio Points) sending the vibrations to the sub-flooring system and/or ground.
According to one white paper, vibration is seeking to be grounded much like electricity. And properly isolating and/or dampening vibrations is impossible to acheive as this methodology actually traps those resonating frequencies inside the component and rack and thus causing havoc on the sonics primarily in the micro-dynamics and a bit in the macro-dynamics. Traps them kinda' like standstill freeway traffic in Los Angeles on a Friday afternoon.
The mechanical transfer to ground is a one-way street that provides a quick and efficient exit path to keep the adverse affects to a minimum rather than allow them to accumulate.
The best analogy I can think of is sitting in your car at a traffic light and somebody 4 cars aways is blasting his subwoofer. The other car is sitting on radial tires and so are yours. One would think that the radial tires and distance between cars would be an excellent isolator and dampener. Yet, you can still feel the bass in your chest and you can see your rearview mirror vibrate to the beat.
starsound.biz has several papers that goes into much detail and they also have an excellent reputation as being the best performance-oriented rack and point mfg'er.
Since installing their Audio Points under all of my equipment recently and especially under my racks, I can easily see why. Especially after mechanical break-in.