This Clinical Investigation Assesses the Safety and Performance of a New Beamformer for MED-EL Cochlear Implant Recipients.

Inclusion Criteria: * Minimum age of eighteen (18) years at time of enrolment * Experienced MED-EL cochlear implant (CI) user (≥ 6 months) for the ear to be tested * User of a MED-EL Audio Processor (i.e. a SONNET, SONNET 2, SONNET 3, or RONDO 3 ≥ 3months) * Post-lingual onset of severe to profound sensory-neural hearing loss on the ear to be tested * A minimum of 40% speech recognition in the Freiburg Monosyllables Test in quiet at 65 dB sound pressure level (SPL) for the ear to be tested (at the last time tested in clinical routine) * Signed and dated Informed Consent Form (ICF) 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 30 dB (pure-tone average over the following frequencies: 250, 500, 1000, and 2000 Hz) * Implanted with C40X, or C40C on the ear to be tested * Implanted with an auditory brainstem implant (ABI) or Split electrode array * Known allergic reactions to components of the investigational medical device * Anything that, in the opinion of the Investigator, would * place the subject at increased risk * preclude the subject's full compliance with or completion of the study