Recently Art Dudley, a few issues back in a post I think called '3 rules' discussed resonance. He basically said draining efforts via spikes etc just makes the speaker front vibrate more. He said no spikes and use felt pads on everything. Check it out.
On the draining of resonance.....
I have read of the importance of controlling resonance in components that contain motors and transformers. This seems to involve placing isolation points or bearings under components to attract or "drain away" micro vibrations, I suppose, of resonating frequencies. Ok--say this works, but hasn't the resonance already occurred as it is being drained away through the bottom of the chassis? I get the idea of isolating out airborne vibrations carried by the rack, stand, plinth, block, etc, but......really?