Wideband Tympanometry as a Non-behavioral Test of the Speech-weighted Middle Ear Transfer Function.

Inclusion Criteria: * NH subjects * Voluntary written informed consent of the participant or their legally authorized representative has been obtained prior to any screening procedures. * At least 18 years of age at the time of signing the ICF. * Pure tone audiometry: * Air-conduction hearing threshold at all frequencies ≤15dB. * No air-bone-gap. * Normal classical tympanometry: Jerger A (see fig. 1) * CHL subjects * Voluntary written informed consent of the participant or their legally authorized representative has been obtained prior to any screening procedures. * At least 18 years of age at the time of signing the ICF. * Pure tone audiometry: * Bone-conduction threshold at all frequencies ≤20dB. * Two exceptions: * Age-related hearing loss: bone-conduction threshold ≤40dB in the higher frequencies (\> 2kHz). * Carhart notch: bone-conduction threshold \>20dB around 2kHz. air-bone-gap ≥10dB at ≥ 1 frequency. * CI recipients * Voluntary written informed consent of the participant or their legally authorized representative has been obtained prior to any screening procedures. * At least 18 years of age at the time of signing the ICF. * Ear is planned for CI surgery by treating ENT surgeon. * Normal classical tympanometry: Jerger A. Exclusion Criteria * NH subjects * Patient has history of extensive middle ear disease. * Patient has history of middle ear surgery. * Abnormal otoscopy showing signs of tympanic membrane perforation or middle ear effusion. * Severe otitis externa or occlusion of the external auditory canal * Participation in an interventional Trial with an investigational medicinal product (IMP) or device * CHL subjects * Patient has history of middle ear surgery. * Abnormal otoscopy showing signs of tympanic membrane perforation or middle ear effusion. * Signs of structural pathological processes such as tumors, cysts or cholesteatoma. * Severe otitis externa or occlusion of the external auditory canal * Participation in an interventional Trial with an investigational medicinal product (IMP) or device * CI recipients * ear has history of extensive middle ear disease. * ear has history of middle ear surgery. * Abnormal otoscopy showing signs of tympanic membrane perforation or middle ear effusion. * Severe otitis externa or occlusion of the external auditory canal