Hi

Thank you for looking at my post, I appreciate any input and am looking for some expert advice on my situation.

Regardless of this is on purpose or not I hope we can focus on the details below. My primary concern is if something is attached or touching my house

My neighbour is in a wooden house and I am next door in a cast concrete house, there is about 1 meter between us and both of our first floors are partly underground.

There is an excruciating low frequency noise coming from their house to mine and I don’t know how. As their house is wood I cannot see how they can do it without disturbing their living too but it is happening. Times are irregular and I have had everything checked in the house already (water/elec/air con etc...)

One important thing to note is my neighbour is a professional acoustic/sound engineer so this is why I am asking for your input

It is hard to record this low sound so I guess it’s under the hearing spectrum so maybe it’s Info or really low frequency. When I press my ear to the window I can hear it outside, I can’t hear through the concrete wall. When it is on my bed feels vibration when I am in it.

My only guess is a directional speaker in his underground floor with low level frequency coming out but I don’t know. Also if my bed vibrates from it would that mean whatever is making this noise be touching my house somewhere and it’s going through the structure.

The sound is loud and my ears are ringing from it. I have had my hearing checked out also.

Any input or questions are appreciated, thank you for your time