Inclusion Criteria:  Aged 18 years or older. Post lingually deafened. Implanted with the CI600 Series (CI612, CI632, CI622, CI624), CI500 Series (CI512, CI532, CI522) or Freedom Series (CI24RE(CA), CI24RE(ST), CI422). At least 6 months experience with a cochlear implant. At least 3 months experience with a Nucleus 7 (CP1000) Sound Processor Able to score 30% or more at +15 SNR with CI alone on a sentence in babble test Willingness to participate in and to comply with all requirements of the protocol. Fluent speaker in English as determined by the investigator Willing and able to provide written informed consent  Exclusion Criteria:  Additional disabilities that would prevent participation in evaluations. Unrealistic expectations on the part of the subject, regarding the possible benefits, risks and limitations that are inherent to the procedures. 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. Currently participating, or participated in another interventional clinical study/trial in the past 30 days or if less than 30 days, the prior investigation was Cochlear sponsored and determined by the investigator to not impact clinical findings of this investigation.