Surround sound

So just a random rant/question........who the hell hooks up surround sound in an old apartment complex?! Well apparently it's my next door neighbors because there is constantly a low booming thud that comes from their wall every time they watch tv and play music. It is absolutely obnoxious. I knocked on their door when they first moved in and asked them to turn it off and they apologized but they still use it. I'm wondering where common courtesy went in life because it is few and far between these days.