congrats, you've put one category into the running. now explain the other two that still can't be reached by the vast majority of people
Maybe if you actually bothered googling you would find a lot more results reaching the limits of less than 13hz.Delta is very hard to hit especially with that low amount of hz.
Oh so you googled "good headphones" and that makes you smart?
I closed my eyes and listened to the deep sleep tone for 4 minutes, on my iPod, laying on the couch, and when I opened my eyes I felt drowsy.Hows that for facts?
can this be used to get me high or have an climax?of not, then meh
I tried listening to the 13hz one with my stuffty 0 cent ear buds from a airport.My brain hurts, for real.
Try a higher frequency, sometimes that happened to me with the lower frequencies
idoser
I like how you ignored my whole post to make a snarky one-liner