The EA853 is a stand alone headphone amplifier with extra facilities for use in e.g. a presenter booth. Interfacing is possible from the control room via-multi way connector and cable, carrying DC control and audio input signals. This unit can be used in combination with most EA On Air Mixing Consoles like the SRM, S130, S340 and S440. The unit has four separate adjustable headphone outputs, two highlevel loudspeaker outputs (with possibility for relay mute option) and a COUGH button with MIC ON signalling. Separate inputs for presenter and guest allow talk-back signals only to be heard by the presenter(s).