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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
chadnliz

Showing 1 response by pbowne

pbowne
75 posts
 

I'm going to be lazy right now and not do the actual math, but the length of a low bass signal is about 20 feet or more, if I remember correctly. A space of 1-3 inches doesn't greatly diminish its transmission.

This leads me to another discussion that a friend brought up. If my listening room is 18 feet long by 12 feet wide, is there a practical limit to how low a bass signal I can hear in the room? That is, if the length is shorter than the distance between the low-bass waves, does that stop me from hearing them?
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