If you want only to "drain off" internal vibrations created within a piece of equipment, then you need a "mechanical diode" like cones, rollerballs or graphite bags. (A "mechanical diode" BTW is something that lets the vibration travel in one direction but not back the other way.) Assuming a steady, rock solid surface on which the equipment sits, this works pretty well for both transports and electronics (i.e. amps that sometimes have transformer or tube vibration.)
If you want to protect a piece of equipment from external, non-airborne vibrations that are transferred to the equipment from whatever it's sitting on, then you need a vibration damper or shock absorber like Stillpoints, Sorbothane pucks, or springs. These can make the equipment somewhat more susceptible to airborne sound energy (-- not generally a problem I've found, unless it's sitting right in front of a loud speaker.)
So, except for turntables, which in my opinion always need both type of treatment (diode at the shelf, and squishy between the diode and the plinth) most situations only require the diode (again, assuming a rock solid non-vibrating surface on which the equipment sits.)
If you feel your situation requires both types, you could try at least 9 combinations of devices picking one from each category, and then multiply by 2 to allow for the squishy-over/under-diode variation and that gives you 18 ways to Sunday. My personal preference, if anyone gives a rat's a**, is cones under sorbothane, with Stillpoints replacing both for heavier equipment (rated at 200# capacity each I believe.)
