Anatomy-based Fitting in Cochear Implant Users

Inclusion Criteria: * Age ≥ 18 years * Post-lingual onset of severe to profound sensory-neural hearing loss in the implanted ear(s) * Post-OP CT scan of the CI electrode available * Subject implanted with MED-EL cochlear implant(s) * Subjects received a Flex28 or FlexSoft electrode * Subject planned to receive a SONNET 2 /RONDO3 audio processor on the newly implanted side * Audio processor not yet activated on the newly implanted side * The most apical active electrode contact has to be inserted at least 450° * Minimum of 10 active channels can be activated * Fluent in Spanish * Signed and dated ICF before the start of any study-specific procedure Specific inclusion criteria for the possible study groups • Bilateral CI users: Bilateral CI implantation SONNET 2/RONDO3 audio processor on the first ear implanted * 40% speech recognition a monosyllabic word Test in quiet at 65 dB SPL (last time tested) on the already implanted side * 40% speech recognition in a sentence test in noise (10 dB SNR) on the already implanted side First activation of the already implanted side between 3 and 12 months prior to study inclusion • Unilateral CI users: Unilateral CI implantation CI user with contralateral hearing ≥ 60 dB (PTA measured at 500, 1000, 2000, and 4000 Hz) • SSD CI users: Unilateral CI implantation CI user with contralateral hearing ≤30 dB (PTA measured at 500, 1000, 2000, and 4000 Hz) Interaural threshold gap ≥40 dB • Bimodal CI users: Unilateral CI implantation Contralateral ear adequately fitted with a hearing aid CI user with contralateral hearing ≥30 dB (PTA measured at 500, 1000, 2000, and 4000 Hz) CI user with contralateral hearing ≤55 dB (PTA measured at 500, 1000, 2000, and 4000 Hz) Interaural threshold gap ≥15 dB Exclusion Criteria: * Lack of compliance with any inclusion criteria * EAS user (user of an EAS audio processor) * Implanted with C40+, C40X and C40C * Implanted with an 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 or preclude the subject's full compliance with or completion of the study