Component dampening

3M makes some stuff, you can also get car audio padding for that purpose, like Dynamax (get Xtreme).

KP

Try adhesive-back polymeric damping sheets. Used for vibration control, on pipes, cars (under the hood, for example).
Available probably at local (large) h/ware store. I got mine from McMaster-Carr.
Cheap and VERY effective in my system! Cut to size and use on front-plate, top-plate, sides, caps... (BUT BE CAREFUL NOT TO TOUCH EXPOSED PARTS OF CAPS WHEN YOU OPEN THE MACHINE).
Cheers!

Soundcoat.Email Frank At AudioEssentials@aol.com

I really try to keep my components dry. Dampening them is just not a good idea. DAMPING their vibrations, however, is
usually best done with a few pieces of sticky asphalt, and then isolating them with Neuance or Rollerblocks, etc.
Sorry to be the grammarian again....

By Asphalt, do you mean like asphalt shingles?

I actually prefer Ice and water shield, especially "Grace" brand.