Main objective:
For a bimodal fitting (hearing aid (HA) + cochlear implant (CI)): Comparison of a tonotopy based fitting strategy (TFS4) to a default fitting strategy (FS4) for the speech recognition in noise.
Secondary objectives:
Comparison of TFS4 to FS4 for speech recognition in quiet. Comparison of TFS4 to FS4 for the auditory skills experienced by the subject.
Adult patient (>= 18 years old) speaking French
Patient who fulfils the criteria for cochlear implantation
retro-cochlear pathology: auditory neuropathy, vestibular schwannoma
patient with residual hearing < 70 dB hearing level (HL) at 500 Hz and 1000 Hz on the contralateral ear