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Below are definitions of useful acoustical terms. These definitions are explanatory in nature, rather than technically detailed. Please refer to a qualified professional or text for more precise definitions.
Decentralized systems consist of Master and Satellite Units. The Master includes the electronics for sound generation, and controls for volume and contour adjustment. Local changes must be made by entering the ceiling and physically accessing those controls. Only global volume changes and timer functions can be centrally controlled. Also referred to as distributed or self-contained systems.