Quoted from Wikipedia
The human head imprints frequency-dependent distortions of phase and amplitude on sound reaching the eardrums, that are frequency-dependent level differences and these distortion effects vary with the direction of the sound source (being caused by the geometry and sound-transmitting characteristics of the sinus and throat cavities, eustachian tubes, inner ear, external ears, and other hard and soft tissues in the head and upper body (see: head-related transfer function, "HRTF").
Experiencing this on your own is better than any explaination given, just plug in your headphone ( yes, you must use headphone to experience it ) and simply play the clip given =D
Download Audio Clip
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