Neighbour is torturing me with sound

You need to verify this is really happening. Everyone has different tolerance for sound---especially low frequencies. He could be attempting to "torture" you. Or, he could just be watching a movie.

DL rew-5(free) on a laptop and spend $50(ish) on a UMIK. You will be able to measure what is really going on. This will also be important if you decide to pursue legal action.

It tends to be somewhat difficult and expensive to reproduce ultra low frequencies(under 20-25hz) so this may be much higher in frequency or he may have an system designed for such. Or it could be something else entirely.

There have been documented cases of low frequencies bothering people that lived a mile away from the actual source.

/r/legaladvice Thread