Low-frequency sound is sound with a frequency below 100 Hertz. The lower the frequency, the further the sound travels, and the louder the sound must be in order to be able to perceive it. Sound of less than 20 Hertz is inaudible to a human, but can be felt.
For many people, low-frequency sound is not immediately perceptible. But those who do perceive it can suffer a lot from it. They complain about health problems, such as insomnia, stress and heart complaints.
At Windpark N33 in Groningen, tones between 40 and 50 Hertz were found. On the website onlinetonegenerator.com you can listen to which low tones you can still hear.
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