Similar probably to what Shady was suggesting with a couple layers of foam... the right foam pads would do the trick nicely. (Question is, can you diy it for under $50, delivered from amazon, next day free?
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Unless you have down firing subs!
Part of the reason for my craziness with the floor-coupled platform and isolation feet.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)