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justtoreplyto
on April 21, 2015
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Have you heard 'the hum'? Mystery of Earth's low d...
Not sure how it would work during a blackout, but it sounds like you're listening to a mains hum.
http://en.wikipedia.org/wiki/Mains_hum
simcop2387
on April 22, 2015
[–]
Depending on the blackout cause there could still be live powerlines nearby. If a local transformer blew then the lines feeding it would likely still be live until they shut them off to replace the transformer.
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