This question already has an answer here:
For example Sennheiser HD 800 has 6 to 51,000 Hz but humans can only hear 20 to 20,000 Hz. Is there a benefit in terms of sound quality to humans if they listen to something they can't hear?
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merged by AJ Henderson♦ Oct 2 '17 at 13:49
This question was merged with What is the point of a frequency response higher than 20 Hz to 20 kHz? because it is an exact duplicate of that question.
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sound.stackexchange.com/questions/22102/… – georgi Feb 14 '14 at 16:08
