A pure tone audiogram with a dip at 2000Hz is characteristic of
In otosclerosis, there is a dip in bone conduction curve. It is different at different frequencies but maximum at 2000Hz and is called Carha's notch. Ref: Diseases of EAR, NOSE and THROAT by PL Dhingra; 7th Edition; Page no.96
Presbycusis
Ototoxicity
Otosclerosis
Noise induced hearing loss
Ear