Benefits of the HiResolution Bionic Ear System in Adults With Asymmetric Hearing Loss

Inclusion Criteria: General Requirements: * Ability to provide Informed Consent * 18 years of age or older * English language proficiency * Willingness to participate in all scheduled procedures outlined in the study investigational plan * Willingness to use an approved cochlear implant signal processing strategy in an everyday listening program during study Ear to be Implanted: * Severe-to-profound sensorineural hearing loss (\> 70 dB HL) as defined by the pure tone average for 500, 1000, 2000 and 4000 Hz * CNC word recognition score ≤30% (tested in subject's everyday listening condition for that ear) * Duration of severe-to-profound sensorineural hearing loss (≥ 70 dB HL) \>3 months and ≤10 years in the ear to be implanted only Contralateral (non-implanted) ear: * Up to a moderate sensorineural hearing loss (\<70 dB HL) as defined by the pure tone average for 500, 1000, 2000 and 4000 Hz * CNC word recognition score \>30% (tested in subject's everyday listening condition for that ear) Exclusion Criteria: * Previous experience with a cochlear implant * Cochlear malformation or obstruction (i.e. ossification) that would preclude full insertion of electrode array in the ear to be implanted * Medical or psychological conditions that contraindicate surgery or impact the ability to manage an implanted device or the study related procedures as determined by the investigator * Diagnosis of auditory neuropathy/dys-synchrony in either the ear to be implanted or the contralater…