Both conductive and sensorineural damage drastically alters absolute threshold curves.

Evidence

The MAP and MAF functions were measured using earphones or speakers as transducers. Both of these transducers activate the air conduction pathway of the ear and involve the entire auditory system. Consequently, conductive (damage in the outer or middle ear) and sensorineural (damage at the level of the cochlea or auditory nerve) hearing loss can have a drastic effect on the MAP and MAF curves. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 259