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The frequency selectivity of the vibration of the cochlear partition structures depends on the function of the cells known as

These cells act like little motors and enhance the frequency  as well as the greater sensitivity to one frequency of sound than to others. 

Thus, damage to these cells at one point along the cochlea's length will cause these cells at that point to lose their normal high selectivity and sensitivity to one  of sound above others and they become both less sensitive to sounds overall and less  for frequency of sound.

These effects will be passed on to the auditory nerve fibres connected to the

Thus, the brain receives information from that point that is no longer sensitive for sounds and also less selective - i.e., you are hard of hearing for those frequencies to which that region of the cochlea used to be most sensitive.