Investigating Stimulation Parameter and Electrode Mode Changes on Speech Perception in Experienced Adult Cochlear Implant Recipients

Inclusion Criteria: * Implanted with the CI600 Series (CI612, CI632, CI622, CI624), CI500 Series (CI512, CI513, CI532, CI522) or Freedom Series (CI24RE(CA), CI24RE(ST), CI24RE(CS), CI422) * At least three months after activation of the cochlear implant. * Eighteen years or older at the time of consent. * User of 900Hz ACE (Advanced Combination Encoder) strategy MAP. * Score of 20% or more for CNC words presented at 60dBSPL with CI alone in the test ear. * Fluent speaker in English. * Willing and able to provide written informed consent. Exclusion Criteria: * One or more electrodes turned off in the MAP used regularly. * Unable or unwilling to comply with the requirements of the clinical investigation as determined by the Investigator. * 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).