>It's *harder* to hear when someone is sneaking up behind you. But with
>2D headphones it's *impossible*.

Could be, but that is not proof that headphones can provide 3D. It 
probably means that the headphones are connected to only some of the 5 
channels.

Go over to Wikipedia and read the very fine article on "sound 
localization." It points out that to get more than 2D you need more than 
2 detectors (a.k.a. ears) or to move the detectors (i.e. move your head).

Anyone claiming to be able to do this with headphones must therefore have 
more than 2 ears and OMG! must be one of those Martians who are in 
command of Windows 7. OMG! OMG! They are already amongst us!


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