Spikes couple the speaker or component to what it is sitting on. Generally not a good thing in my opinion and experience. The speaker should be allowed to vibrade at the driven frequencies. To do this isloate it on springs.
Same with components to isolate them from vibrations coming up through he rack. Soft rubbery or sorbothane feed are in between and generally not a good solution.
@mazian I'm both an engineer and a physicist so does that make me doubly evil? I recommend the townshend platforms for speakers. Very stable and a game changer.
Jerry