I know your frustration! About 13 years ago I assembled a home theatre system in a 4 level condo/townehome. I lived on the third floor and the other couple on the 4th floor. They never told be to turn down my system but instead they chose to get even. Late at night they would stomp on the floors. Long story short they drove me out of my place. They were evil and I was no match for them. My advice is to make arrangements with your neighbours like I usually listen at this time and on these days.
Good Luck!*>)
Good Luck!*>)