<P> Hearing range describes the range of frequencies that can be heard by humans or other animals , though it can also refer to the range of levels . The human range is commonly given as 20 to 20,000 Hz , though there is considerable variation between individuals , especially at high frequencies , and a gradual loss of sensitivity to higher frequencies with age is considered normal . Sensitivity also varies with frequency , as shown by equal - loudness contours . Routine investigation for hearing loss usually involves an audiogram which shows threshold levels relative to a normal . </P>
<P> Hearing range describes the range of frequencies that can be heard by humans or other animals , though it can also refer to the range of levels . The human range is commonly given as 20 to 20,000 Hz , though there is considerable variation between individuals , especially at high frequencies , and a gradual loss of sensitivity to higher frequencies with age is considered normal . Sensitivity also varies with frequency , as shown by equal - loudness contours . Routine investigation for hearing loss usually involves an audiogram which shows threshold levels relative to a normal . </P>
frequency of the lowest sound that the normal human ear can perceive
frequency of the lowest sound that the normal human ear can perceive
20
20