Has anyone heard anything like this in the Pennsylvania area?

Is it ambient noise from 400 or the Perimeter? Or is it clearly distinct from that? Some of the sounds seem to come from above and some from below. Does it have a direction or is it just all around?

For what it's worth, people may be just hearing the upper spectrum of the noise. It's funny that for the longest time, people did not realize elephants were making a ton of sounds they couldn't even hear. One lady who now has been doing elephant communication research for over a decade, first felt what she felt was a throbbing or pulsing feeling when near the elephants. Using certain recording and playback techniques, they discovered that elephants were making a ton of low frequency sound to communicate that humans could not hear.

So.. you may just be hearing some of what's going on. There could be a lot more.

Just wondering OP if you have heard this again since your recording? Is there any way you could get us a longer clip? I still think the duration of the stability of the sound could lead to the elimination of some possibilies of the origin of the sound. It would really help if it could be a little louder too.....I know you said this is only a phone recorder so you can't expect too much. This is so fascinating.

It's almost definitely planes. I live about 20 miles from an RAF airbase here in the UK where they have Hercules transport planes running their engines (propeller driven) for long periods.

The sound is Exactly the same.

Originally posted by Riakennor
It's almost definitely planes. I live about 20 miles from an RAF airbase here in the UK where they have Hercules transport planes running their engines (propeller driven) for long periods.

The sound is Exactly the same.

I was just going to post that it sounds like a C-130 to me. A military cargo plane, turboprop also known as the Hercules. I've worked them as an air traffic controller for 20+ years. I'm with Riakennor on this one

There's obviously a lot of people from Atlanta here, i'm in Dunwoody myself.

If it happens regularly and for a long time, maybe we should try and notify each other if we hear the noise to corroborate it?

But there are constantly c-130's leaving dobbins, circling Atlanta, then down to Lockheed where they're armed. But they're usually too high to hear...

Originally posted by alexagendajones
sounds are a hoax come from movies "red State" and "war of the worlds"

come on folks

Nice try but i compered them to the sounds they dont sound anything alike

I have heard the sounds before and it sounded like an dozens os f-16s floating around the sky in different places with their afterburnes on. Best way to discribe it.

what if this is the start of project blue beam??

Originally posted by kosmicjack
Is it ambient noise from 400 or the Perimeter? Or is it clearly distinct from that? Some of the sounds seem to come from above and some from below. Does it have a direction or is it just all around?

Interesting point and you heard right the one i heard actual came from above i would believe in the area where i live.
i dont live near subways.

I'm hard of hearing due to chronic infection so I can't hear the humming on the tape ... but, a few years ago I started hearing a constant hum and it continued for a few days. The low hum was making me nuts! I was looking for reasons that would cause the sound, found nothing. After about 4 days the sound stopped.