This article I stumbled upon just blew my mind and not going to lie, freaked me out. I would love to hear some thoughts.
***I apologize in advance for not being a contributor and providing a lot of response. I’m a homeschooling parent of many and just got one down for a nap. Now I have lessons with the others.
That's funny you would downvote the only person telling you what it actually is. It is the bass track. Only people who don't understand how surround sound is achieved could think this is a secret infrasonic track. The subwoofer is the ".1" in 5.1 surround. Low end bass sounds are separated from the midrange and highs and sent to the subwoofer in theaters and home surround systems. It makes the booms boomier. That's what this audio file is.