Every hear of Dolby Headphones? They did some research and discovered that the angle at which a sound enters your ear canal alters the sound slightly. Your brain interprets this alteration as directional information. Dolby figured out the formula for altering sounds to make them sound like they're comming from more than just two directions and designed a set of headphones to use this formula. The headphones didn't sell very well so they stopped making them, but now they licence the formula to other companies to use. Pearl Harbor on DVD has a special Dolby Headphones audio track, and PowerDVD has a Dolby Headphones mode; if you have access to either of those then you'll know it really does work.
Other companies have tried to duplicate the results, but they're not as good as Dolby except for maybe Bose's 1-2-3 system, which uses speakers instead of headphones. I don't know whether Ensonido uses Dolby or something else.
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