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Ron3rd's avatar
Ron3rd
Explorer III
Dec 14, 2018

Riddle Me This Batman; Low Frequency Hum: SOLVED

...in the sticks and bricks that is.

In one of our rear bedrooms, if you stand in a certain spot, there is a low frequency hum that can be heard. Drives the wife crazy. Not loud, but a soft hum. Sounds like some sort of electrical hum and I can't tell where it's coming from. In that part of the house, there is nothing in the attic and nothing unusual in the walls.

To see if it was something hidden and electrical, I turned off the power to the house. The hum is still there. What say you Batman?
  • Ron3rd's avatar
    Ron3rd
    Explorer III
    Old-Biscuit wrote:
    Doorbell transformer?


    I turned off all the power to the house. Still there
  • Ron3rd's avatar
    Ron3rd
    Explorer III
    Mmwtdh wrote:
    Turning the electric off eliminates a lot of possibilities.

    It has to be harmonic unless it's generated from off site and only being picked up in that particular spot.

    Any wind turbines, factory, power plants, etc. nearby?


    None nearby. And it's very localized to about half of the room
  • Turning the electric off eliminates a lot of possibilities.

    It has to be harmonic unless it's generated from off site and only being picked up in that particular spot.

    Any wind turbines, factory, power plants, etc. nearby?
  • Ron3rd's avatar
    Ron3rd
    Explorer III
    It's constant. Never goes away. I can't rule out some sort of harmonic but can't see what could cause it.
  • constant or it comes and goes? in the right weather conditions our rooftop TV antenna will vibrate and sound like a hum. but it has to be the right combination of temp, humidity, barometric pressure and wind.

    or

    if you live near a high powered VHF radio transmitter like at a major airport the radio modulation can cause metal pipes to vibrate and hum. rare but it can happen.

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