Not to rain on your parade but what you want is why folks buy their own homes. Even if you were able to reduce the volume of the highs/mids that pass thru the walls by using soundproofing materiels the bass waves are still going to pound that kid's room at medium high volume. I think you are between the proverbial rock and a hard place.
Bottom line is that you have to keep the volume down to a level where it is not intrusive on your neighbors relative to the time of day. If you don't you are probably in violation of local nuisance laws and probably your lease.
Bottom line is that you have to keep the volume down to a level where it is not intrusive on your neighbors relative to the time of day. If you don't you are probably in violation of local nuisance laws and probably your lease.