In college in the late 80's I lived above an individual who had some anger problems. I finally got fed-up with threatening and calling the police when he'd hav

In college in the late 80's I lived above an individual who had some anger problems. I finally got fed-up with threatening and calling the police when he'd have punching fights with his GF so I took a 15" Electro-Voice subwoofer and mounted the speaker downward facing directly to the concrete floor using concrete anchors with my apartment serving as a free-air enclosure. I then connected it to a class-a tube amp & piped in a 20Hz signal from a frequency generator I got from a university yard sale. Whenever he was alone in his apartment at night I'd turn it on. He moved out within the month. Interestingly enough, the landlord later saw the setup and I was subsequently evicted.