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  2. It was around 2005 that Simon Payne started hearing it. A strange, low, rumbling sound that travels through walls and floors and seems to come from everywhere.

  3. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    The hum was louder inside their house than out, in part, they believed, because their house vibrated in resonance to the 60 Hz hum. In the lawsuit they claimed that the volume of the hum was measured at up to 64.1 dB in the couple's home.

  4. A Ghostly Nighttime Hum Is Invading Random Towns ... - AOL

    www.aol.com/lifestyle/ghostly-nighttime-hum...

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  5. Infrasound - Wikipedia

    en.wikipedia.org/wiki/Infrasound

    The report "A Review of Published Research on Low Frequency Noise and its Effects" [54] contains a long list of research about exposure to high-level infrasound among humans and animals. For instance, in 1972, Borredon exposed 42 young men to tones at 7.5 Hz at 130 dB for 50 minutes.

  6. Electromagnetically induced acoustic noise - Wikipedia

    en.wikipedia.org/wiki/Electromagnetically...

    The phenomenon is also called audible magnetic noise, [1] electromagnetic acoustic noise, lamination vibration [2] or electromagnetically induced acoustic noise, [3] or more rarely, electrical noise, [4] or "coil noise", depending on the application.

  7. Mains hum - Wikipedia

    en.wikipedia.org/wiki/Mains_hum

    Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity. The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz , i.e., 100/120 Hz, depending on the local power-line frequency .

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