Vibration Theory - Isolate or Drain?

Placing my friend's TT directly on the rack, it played fine. Putting cones under certainly seemed to improve the sound. Flipping them upside down, putting the cones 'point up' caused it to mistrack on some passages. This, to me, suggests "draining" does occur. By the way, the cones were short, wide and made of aluminum.
There are two sources of vibration: Internally generated, and externally generated (sound). I would think that using something like sorbothane would isolate. But what about vibration from a component itself, or picked up from sound waves?
How about both approaches? Cones under a component that has damping pads/and or weight, sitting on or "draining into" a platform that absorbs and is sitting on sorbothane feet to isolate.
Someday I plan on trying something like this under my TT.

Rakuennow -In my experience, cones "drain" in one direction. Try putting "spikes" or cones upside down under a Turntable as I described above if you doubt it. My guess is that ball bearings isolate better as opposed to "draining". If the cones drain the vibration into a platform, chances are the materials will absorb at least some of the vibration. It would take a carefully engineered rack to transmit all that vibration to other shelves. Also, I believe most people will respect the weight limits of the rack they choose to use.
Thanks for the reminder that viscoelastic materials turn mechanical energy into heat. Good to know.
In audio, one of the sources of vibration is the very thing you are generating- the sound. This poses problems that are unique in application.
Even if you doubt the significance of vibration control for most components, you must see the benefits for analog equipment.