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I don't think its my ears and my wife hears it too. I guess it's at about 70 Hz? It's very constant in frequency and maybe I'm only hearing a harmonic of a lower one?

Took a little drive about a mile out and its still there, a good distance from any industrial buildings.

Drives me a little nuts.

My laptop and phone mikes don't seem to pick it up, I don't see any discernable peaks in the spectrum analyzer with Audacity.

Maybe there is a pump running somewhere, since we had torrential rainfalls since about yesterday. But to still hear it, almost two kilometers out?!?

I don't think its my ears and my wife hears it too. I guess it's at about 70 Hz? It's very constant in frequency and maybe I'm only hearing a harmonic of a lower one? Took a little drive about a mile out and its still there, a good distance from any industrial buildings. Drives me a little nuts. My laptop and phone mikes don't seem to pick it up, I don't see any discernable peaks in the spectrum analyzer with Audacity. Maybe there is a pump running somewhere, since we had torrential rainfalls since about yesterday. But to still hear it, almost two kilometers out?!?

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[–] • 2 pts

lol You're gonna scare the shit outta him. A free audio analyzer app on a phone with a (usb/lightning) microphone to walk around and spot the source/origin of that noise will do. :)

Yeah this setup can get quite pricey, but it would be necessary for proper analysis of the sound. His phone might do alright, but it seems like he already gave that a go and didn't have good results. Might be able to buy a cheap used Tascam or Zoom portable digital recorder on eBay and get better pickup. My Tascam DR-70D picks up a lot of things I wouldn't have expected it to with its built in mics. I got mine cheap on eBay ($25) because it had a broken headphone jack which I fixed in under an hour.