A bimodal hearing stimulation system comprises an implantable stimulation assembly for applying neural stimulation to a patient's hearing according to an electrical stimulation signal； an acoustic stimulation unit for applying acoustic stimulation to the patient's hearing according to an acoustic stimulation signal； and a sound processor for generating the electric stimulation signal and the acoustic stimulation signal from an input audio signal. The sound processor is configured to divide the input audio signal into a plurality of frequency bands. The sound processor comprises a weighting unit for dynamically determining for each of the frequency bands a relative loudness weight of the electric stimulation and a relative loudness weight of the acoustic stimulation as a function of the present level of the input audio signal in the respective frequency band. The sound processor is configured to apply the weighting function when generating the electric stimulation signal and the acoustic stimulation signal.
