Thanks, there are some interesting and affordable ideas here, regarding vibration control.
Several years ago I came across a product that was made for underlayment for marine flooring, that I found works very well for a dampening and isolation buffer. It is a sheet of 3/16" dense felt, bonded to a 3/16" layer of rubber.
What worked well for me was to cut out various sized squares (2"x2", 3'"x3", etc.) from the sheet of underlayment and put them in the corners between my 2" thick Back Walnut butcher blocks and the rack shelve and then couple the component to the butcher block with brass cones, with a thin felt washer between the component and base of the cones. The purpose and archived result is coupling the component to the mass of the block and isolating the block and component from the resonance of the rack.
With a little ingenuity and a bit of work, it shouldn't cost a fortune to achieve affective resonance and vibration control......Jim