New answers tagged sound-proofing
I don't think it's practical to come up with a definitive answer without experimentation, but I would try these: sheets of rubber, such as what is sold in the plumbing section of the hardware store, maybe folded over a couple times sound isolating feet sold for washers/dryers
In many locales, fire protection regulations require that all holes between levels be sealed to prevent easy spread of flames. This is most often done with a fire retardant foam spray. This should also reduce noise transmission between levels. Two for the price of one! Images and links are illustrative only, not an endorsement of goods or sources.
Suspend a heavy rolled-up quilt (get it from a flea market or discount re-seller) above the door. When you are inside, unfurl the quilt so it covers the entire door and frame. probably your best option for the money you are willing to spend.
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