Before I bought the Bible:
I had two Bose subwoofer / satellite setups that, properly set up has one subwoofer in each of two corners that are diagonal from each other. Because of a hyper neighbor (and the fact that I was setting up my room above the garage as a bit of a club with loud music and lighting), I put both subwoofers in the corner farthest away from his house. During testing, there was very little bass, but he can over banging on the door and saying everything in his kitchen was vibrating and bouncing!
Turns out, the subwoofers were so close together that the sound waves were combining to become one huge wave that was too large to be experienced in my room, but were being felt by the neighbor I was trying not to annoy! 🤣