I look at vibration control through an RF impedance matching background. Spiking heavy speakers or platforms improves sound by rejecting high energy bass frequency vibrations in a suspended wood floor moving up into the component or speaker.
Varying pressures in the floor and around supporting beams due to concentrated weight on spikes causes diffraction or reflection of sound, stopping travelling waves in the wood medium moving up the speaker or component. An abrupt change in density is a fraction of bass frequency wavelengths, rejecting sonic conductance which minimizes cross talk between woofers from left to right speaker or speaker to component. Bass frequencies have the most energy and can morph into higher frequency resonance in cabinets and audio racks.
That is just the start of treatment as I understand it. Performance improves if the fraction of vibration that finds it way up the feet or leaving the feet is attenuated as loss or sound absorption through the use of rubber, sand, isolation feet or platforms - whatever provides wideband absorption of vibration energy.
Basically you want to minimize reflection which is return loss in RF world by matching impedances. That is density and stiffness for maximum sonic conductance of materials. That's how cones work to pull high frequency vibrations out of components. Bass frequencies leaving speakers are best treated with loss through isolation since energy is high and will reverb through the floor. Higher frequency energy will not cause trouble in the floor, but should not be reflected off the isolation footer back into the speaker or component.
Antenna are tuned or impedance matched for minimum return loss. If we use loss to extend bandwidth and minimize return loss , gain suffers. Fortunately, using loss in vibration control can improve performance with no downside since we are not trying to transmit vibrational energy through the floor at same time.
