Introduction: Bilateral-bimodal hearing, cochlear implant on one ear and hearing aid on the other ear (CI/HA) may benefit from bilateral-binaural effects as a result of using two hearing systems, and a bimodal effect as a result of using two modes of stimulation, namely acoustic via a HA and electrical via a CI. The two modes of stimulation complement each other and may overcome the limitation of electric hearing alone. However, alongside the expected benefits of having two hearing systems in bilateral bimodal hearing, there are several inherent mismatches in combing two different stimulation methods, which may negatively impact the processing of the binaural cues. These mismatches include mismatch in the incoming speech signal timing; mismatch in pitch balance between two devices, mismatch in the frequency range conferred, and mismatch in the frequency range conveyed to a specific location in the cochlea by the cochlear implant and to a different location in the contra-lateral cochlea by the hearing aid.