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A Procedure for Controlling Room-Ring Modes and Feedback Modes in Sound Systems with Narrow-Band Filters

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This paper describes a procedure used in approximately fifty rooms with sound reinforcing systems, in the development of a process for controlling major room-ring modes. These are the modes which seriously interfere with the performance of the room itself, in the absence of a sound system, and of the room and the sound system viewed as a total electro-acoustic system. Our procedure employs a combination of narrow-band filters, each centered on its mode as the modes occur, and various types of broad-band equalizers which are conventionally used in smoothing the over-all response.

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