I am suffering from a strange hum in my home. I have just bought my home and living in 3 months. A month ago I've started to hear a humming noise. Then, I recorded the sound and looked at its frequency response. The peak was at 50 Hz. After a while, I started to use an application named "SignalScopeX" for iPhone. It gave me the same results, in this app you can see the response in real time and there is a peak at exactly 49 Hz. I measured several times (in night and day) and the sound exists every time. Is there a possibility that in pure silent mics response 50 Hz, or is it real sound? I hear it but still I want to be sure about that. I suspected an electrical machine vibrating my walls (I am living in Turkey, main electricity is 50 Hz). Me (living in 6th floor) and my neighbours (living in 5th and 7th floors) cut of our home electricity but still, the sound is exists. What can be the reason of the sound?
Some of my thoughts are:
- There may be a constant working motor like an aquarium on the 10th floor. Is it possible?
- There is a general electricity line of building in one of my room. If there is any leakage may it cause the sound? How can I measure it? Are there any more possibilities?