The purpose of this study is to evaluate audio quality benefit for the patient implanted with a Cochlear or Otologics Carina implant with the new firmware (feedback canceller algorithm) whatever the patient environment is and to evaluate the functional gain and speech understanding benefit for the patient upon the firmware used (new and reference firmware). The new firmware aims to adapt automatically for feedback cancellation without prior calibration.

Inclusion Criteria:

• successfully implanted with a commercial available CE-labelled implant device, resulting in measurable open set speech understanding
• native speaker in the language used to assess their clinical performance, i.e. French

Exclusion Criteria:

• unwillingness or inability to comply with all of the investigational requirements
• additional handicaps that would prevent or restrict participation in the audiological evaluations