Anyone know exactly HOW the Zen X-Fi makes MP3s sound better quality wise?

"Indulge in rich audio where you can hear your music in crystal clear clarity. Take in guitar strumming, crisp cymbal clashes and deep pounding bass as detail lost during file compression are now beautifully restored. The built-in X-Fi technology intelligently moves a conventional left/right earphone stereo source away from your ears, virtually expanding it for an audio experience with a breathtakingly realistic depth of field. You'll feel as if you were listening to your music from a pair of high end speakers."

Doesn't really explain it in enough (convincing) detail for me...