The Konftel 300 conference phone has been designed with mediumsized rooms to auditoriums in mind. It can be upgraded with external speakers, microphones and headsets, and can also be hooked up to the auditorium’s PA system. External speakers An even more powerful audio effect can be achieved by connecting external speakers or a PA system to the Konftel 300. External speakers and microphones External speakers and microphones (PA systems) can be connected to the Konftel 300 to optimise audio quality in large conference halls.