Just to add to Goinbroke's correct explanation of what spikes are all about, the decoupling of the speakers will give an impression of less bass but in reality there will be more extesion in the lower region (less boom) and not only that but the overall sound will be cleaner.
why spikes under speakers???
could you guys educate me about the use or need for spikes under speakers, it seems to me that putting an air pocket under a speaker would be the last thing you want to do, isnt bas about pressure? and if you put a gap of air between speakers and floor arent you losing some of what makes bass work? I am not claiming this to be bad, I simply want to pose my questions about this concept and get educated on why this is a good idea, and when it may not be a good idea...thanks