I recently posted this link to an excellent article on this subject from the March 2022 edition of Positive Feedback in a different thread, but hopefully it can find some appreciation here as well:
Ten Misconceptions about Loudspeaker Spikes
The article is well written by the senior technical editor of PF and contains concise explanations for all points. Here is the article summary:
- Rigid feet couple vibrations
- Vibration is a two-way street
- Spikes cannot drain energy to a heavier mass
- A small contact point actually amplifies vibrations
- Spikes cannot reduce internally generated cabinet vibrations
- Question one-size-fits-all and no lab report devices
- Isolation means the mechanical path is either broken, or the form of energy is converted to another form
- Properly designed isolation is predictable, repeatable, and neutral in performance
- Isolation will offer clarity that cannot be experienced with coupling, because with coupling comes additional, unwanted vibrations
- Isolation is easy to perceive
- Vibration transmissibility is easily measured