An implantable hearing prosthesis for a recipient patient, the prosthesis comprising: a receiving coil for transcutaneous receiving of an externally generated communication signal; an implantable signal processor in communication with the receiving coil for converting the communication signal into an electrical stimulation signal; an implantable signal transducer in communication with the signal processor and including: one or more electromagnetic drive coils for receiving the electrical stimulation signal; a cylindrical transducer magnet arrangement including an inner disk magnet having a first magnetic field direction, and an outer annular magnet surrounding the inner rod magnet and having a second magnetic field direction opposite to the first magnetic field direction; wherein current flow through the one or more electromagnetic drive coils from the electrical stimulation signal creates a coil magnetic field that interacts with the magnetic fields of the transducer magnet arrangement to create vibration in the transducer magnet which is developed by the signal transducer as a mechanical stimulation signal for audio perception by the patient. 3857450.1 (GHMatlers) P871 88AU.1 7/09/2012 307 30 306 -305 304 -301 303 301 303 FIG. 3A FIG. 3B 406- 404
