http://ask.metafilter.com/122981/Noise-canceling-technology-for-a-whole-apartment
http://ask.metafilter.com/122981/Noise-canceling-technology-for-a-whole-apartment
So if you have upstairs/downstairs/left/right neighbors who thump all day long...the solution is expensive.
The cheap solution is to call Smith and perhaps Wesson.