1. A system comprising: a stimulation management facility configured to direct an electro-acoustic stimulation (“EAS”) system comprising an EAS device communicatively coupled to both a loudspeaker and a cochlear implant to concurrently apply acoustic stimulation to a patient by way of the loudspeaker and electrical stimulation to the patient by way of an electrode communicatively coupled to the cochlear implant; and a fitting facility communicatively coupled to the stimulation management facility and configured to detect an interaction between the acoustic stimulation and the electrical stimulation, and set one or more control parameters governing an operation of the EAS system based on the detected interaction.