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Sound frequency 20Hz ~ 20KHz is generally considered to a normal human hearing range in his/her youth. However the actual fact is, everyone's hearing is different from another person and most of us can't hear sound below 100Hz (but you can feel the air pressure) or higher than 18KHz, cause we don't have golden ear and our hearing degrades as we age.
By that saying, reading into a headphone's frequency response range to determine its sound quality is as bad as trying to read star to determine one's life - a waste of time. There is no measuring device in this world that can tell you how good a pair of headphone will sound to your ear, cause everyone hears thing slightly different from other. The only thing that might give you a hint of whether a headphone is bass heavy or not is the frequency response graph, but they are usually hard to come by.
At the end, your best hope of finding out how an earphone will sound is by either demo a pair, or reading a lot of reviews (head-fi.org is a good place to start). Don't read too much in the spec, they are generally good only for promotion.
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