A couple of thoughts:
Slaw, vibrations are not necessarily reflected back to the components as in the case of your sand boxes. The energy turns to heat and is dissipated as such; perhaps no all of it, but I would imagine a substantial amount of it does. The issue of wether vibrations are reflected back, drained, stored or dissipated and how each possibility affects the sound of our systems is still, I think, not fully understood. Richarkrebs' comment about using the correct epoxy to glue lead is fascinating and goes to my contention that wether we want to admit it or not, a lot of what we do with "vibration control" and how it's effects are perceived is completely system dependent and often no more than a type of "tone control". While I can understand how vibrations can affect the performance of transducers in absolute terms, it seems to me that as concerns electronics and cables it is NOT possible to "overdamp"; other than in the context of a given system. When the perceived effect of damping (or of not damping) is negative it's an indication of tonal inaccuracy in that component or somewhere else in the system. How can eliminating spurious vibrations be a bad thing? I addition, tonal issues affect how we perceive rhythm and timing and even soundstaging. As great as our audio systems sound, they are still far from truly accurate; as in the sound of live music which is why these perceived effects are relevant.
