I've spent enough time on city council noise ordnance boards and understand enough about acoustics to say that the professional sound system I own would certainly be audible and annoying to my neighbors half a kilometer away even if it were not appreciably above the noise floor of the surrounding environment.

Folks are great a signal detection and it's very annoying to them to be able to detect an unwanted bass drum or similar, which they can do at pretty long distances. Even distributed noise is still often noticeable to people.

For instance, I live in the literal middle of nowhere and I still encounter real noise pollution from gas well heads and gas processing plants that are several kilometers from my home.