A Method for Obtaining Natural Directional Effects in a Public Address System

In studying the effects produced by two or more source simultaneously emitting the same sounds, it has frequently been noticed that all of the sound appears to come from the nearest source provided the difference in distances between the observer and the sources lies between fairly definite limits. A group address system was set up to utilize this effect in making it appear to the audience that the amplified sound of the speaker's voice came directly from his mouth. Excellent results were obtained, even with relatively great amplification, when the sound reproducing units were about 20 feet behind and 45 feet above the speaker.