Design Improvements With SONNET 3

Inclusion Criteria: * Implanted with a MED-EL cochlear implant in at least one ear * ≥ 12 months since activation of the MED-EL audio processor * Consistently using a SONNET (EAS) or SONNET 2 (EAS) Audio Processor * Ability to complete all study procedures * Participant and parental (if applicable) commitment to comply with all study procedures for the duration of the study Exclusion Criteria: * Evidence that hearing loss is retrocochlear in origin * Unable to provide reliable feedback during cochlear implant programming * Skin or scalp condition precluding use of the study device * Unrealistic participant or parent (if applicable) motivation or expectations * Participants without a stable fitting map at enrollment e.g., due to changes in hearing, global health status, etc.