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Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. Objective. To study the effects of various active middle ear implant loading parameters on round window stimulation in an animal model. Study Design. Physiological measurements of the cochlear microphonic and stapes velocity were made from active mid-dle ear implant–generated sinusoidal stimuli with controlled changes in loading parameters. Setting. Prospective study at an academic research institution. Subjects and Methods. Cochlear microphonic and stapes velocities (