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    Sound Transmission Class (STC) is a measure for rating the performance of a wall system as a barrier to airborne sound transmission between adjacent closed spaces such as offices. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. STC is the wall equivalent of CAC. STC is measured according to ASTME 90. Adding wall treatments to an acoustical ceiling can improve reverberation time by 87%. 

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