Front-End Processing 3.0

Inclusion Criteria: * A minimum of 18 years old * Experienced user (≥ 6 months) of a MED-EL cochlear implant (CI; C40+ and later model) * Experienced user of a MED-EL SONNET audio processor (≥ 6 months) * Post-lingual onset of bilateral severe to profound sensory-neural hearing loss * Unilateral CI user * A minimum of 10 active electrodes * A minimum of 40% speech recognition in the Freiburg Monosyllables test in quiet at 65 dB sound pressure level (SPL; at the last time tested) * Fluent in German (the language of the test centre) * Signed and dated Informed Consent Form before the start of any study-specific procedure. Exclusion Criteria: * Lack of compliance with any inclusion criteria * CI user with contralateral hearing equal to or better than 60 dB (PTA measured at 500, 1000, and 2000Hz) * User with electric-acoustic stimulation (EAS; user of an EAS audio processor) * Implanted with C40X and C40C * Implanted with an Auditory Brainstem Implant or Split electrode array * Known allergic reactions to components of the investigational medical device * Unstable psychological status * Anything that, in the opinion of the Investigator, would place the subject at increased risk or preclude the subject's full compliance with or completion of the study