Speaker spikes are useless. Vibration is not limited by the small surface at the tip of the spike; it pass through regardless. And massive platforms don't help; low vibrations pass easily through all large surfaces. Concrete floors are not "vibration absorbers" and this is not like grounding a signal. The energy must be redirected through an effective isolator.
The manufacturing industry has dealt with vibration for decades, using springs and ball bearings for vibration control of large machinery. While the scale is much smaller with audio equipment, the principles of physics apply equally. As a result, you see the most effective (and most expensive) premium isolation products apply either or both of these approaches.
The manufacturing industry has dealt with vibration for decades, using springs and ball bearings for vibration control of large machinery. While the scale is much smaller with audio equipment, the principles of physics apply equally. As a result, you see the most effective (and most expensive) premium isolation products apply either or both of these approaches.