DESIGN OF AN AUDITORIUM AUDIO ADDRESS SYSTEM CASE STUDY OF ENGINEERING LECTURE THEATRE GIDAN KWANU

Abstract

This design illustrates how to determine appropriate amplifier and loudspeaker units in the volume of an auditorium, ensuring that everybody receives the same comfortable sound pressure level ( 80dB ) no matter where one is seated. Six loudspeakers were chosen which are in regular array arrangement to ensure uniform distribution of sound. Ten listening points were selected in which distances between the speakers to the points were determined. The power from each speaker to every point depends on the distance between them. The cumulative power from the six speakers gives the average total power in the room. That power is an acoustic power output and the input power which is an electrical power to the loudspeakers depends on the acoustic power and the efficiency of the speaker. The efficiency of the speakers takes care of the system losses. Each . loudspeaker was found to be 50Watts and therefore,300Warts of amplifier gives the appropriate wattage to drive the six loudspeakers.