They figured out a way to recreate total 3d sound immersion illusion with
just a pair of stereo headphones.
You absolutely need stereo headphones to make it work.
http://gprime.net/flash.php/soundimmersion
I must warn you, it is so realistic that it gets creepy.
And NO... this is not some type of think that screams at the end to scare the crap outta you... It's legit.