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Noise Reduction Coefficient
Boettcher Concert Hall
TL Chart for Composite Constructions
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absorbing absorption coefficients Acoustical Society air duct airspace Architectural architectural acoustics ASTM attenuation audience auditorium background noise levels balcony building cavity ceiling Chap concert halls concrete block constructions contour curve decibels diffusion direct sound distance echoes effect enclosure example FASA fiber floor glass glass-fiber graph gypsum board height HVAC installed insulation inverse-square law laboratory layers layout listening conditions located loud loudspeaker low-frequency measured mechanical equipment mechanical rooms mid-frequency mufflers neoprene Noise Control noise reduction open plans orchestra panels performance pipe plenum ratio receiving room reduce reflected sound resilient reverberation reverberation room sabins seating shown side sound absorption coefficients sound energy sound intensity sound intensity level sound isolation sound leaks sound level Sound power level sound pressure level sound waves sound-absorbing materials sound-reflecting source room spaces speech privacy STC rating surface thick tion transmission loss volume wall