Quote:

I came across this article that shows cotton is a great absorber of sound. (If I am understanding the article correctly)
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So I took the little cotton pads you can buy at any drug store and made 8 little speaker feet. I used 6 pads for each foot with a little dab of glue in between the layers to keep them from moving around. It cost me less than $5

Cotton is a good absorber of sound in the form of air-borne energy mostly because of its porous nature. It's effectiveness as an isolator/absorber of mechanically-applied vibrational energy is not comparable because it must be compressed by the load.

I am skeptical of using it for this purpose.

I built my first hi-fi speakers in 1974 when I was living in an all-concrete apartment block on the 3rd floor. The speakers were 8 cubic foot, 3/4" plywood, with Philips 15" woofers. Even with very modest listening levels in my apartment I was advised by the caretaker that my bass was plainly audible all the way to the basement! He made me bases for the speakers that were simply screw-on furniture feet and that solved the problem. Just reducing the contact area between the speakers and the floor reduced the audio coupling greatly.