The Australian Parliamentary Chambers present difficult circumstances for the reinforcement of speech, including an unusually wide dynamic range, large orator-to-microphone distances, high levels of uproar noise, and architectural and acoustical constraints. These cirucmstances were a challenge to designing a sound system that would provide high intelligibility with faithful spectral reproduction, wide angles of coverage, and a high acoustic gain and sound pressure level capability. Recognizing the interdependent of all factors, a holistic process was used to design and specify hardware. The solution included tapered line array loudspeakers and the use of original software. Commissioning the system involved numerical optimization of the gain structure and a novel technique that uses measurements of acoustic loop gain to predict equalizations that optimize the acoustic gain margin.
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