This study will evaluate a range of experimental sound coding strategies that may improve hearing for cochlear implant recipients.

Inclusion Criteria:

• Users of an approved Nucleus cochlear implant.
• Aged 18 years or older (no upper age limit).
• Open set speech understanding sufficient to complete the study protocol as judged by the investigator.
• Fluent speaker in the language used to assess speech perception performance, as determined by the investigator.
• Willing and able to provide written informed consent.

Exclusion Criteria:

• Unable or unwilling to comply with the requirements of the clinical investigation as determined by the investigator.
• Additional health factors, known to the investigator, that would prevent or restrict participation in the audiological evaluations.
• Investigator site personnel directly affiliated with this study and/or their immediate families; immediate family is defined as a spouse, parent, child, or sibling.
• Cochlear employees or employees of Contract Research Organisations or contractors engaged by Cochlear for the purposes of this investigation
• Current participation, or participation in another interventional clinical study/trial in the past 30 days, involving an investigational drug or device (unless the other investigation was/is a Cochlear sponsored investigation and determined by the investigator or Sponsor to not impact this investigation).

Investigational sound coding strategy and default sound coding comparator is blinded to the participant