So you rent a cheap apartment that caters mainly to College Kids. Then you are shocked that there is actually loud music and people playing basketball at all hours...Ummm.
Perhaps people sharing a modem 20 ways would work just fine. That is unless all of those kids are using TWO computers and probably playing on-line games or downloading huge music or video files.
Maby you should call all of their parents to make sure they know how their kids are frittering away their college education. Or if you don't want to get the parents involved, call the cops the next time they are playing basketball in the middle of the night.