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  1. Rapid Speech Transmission Index. A scale which shows the intelligibility of a room or sound system based on the measured consistency in modulated frequencies within the human vocal range between the source and the listener. The higher the number, the better. A scale for testing how well someone can hear in a room. Source: Church Audio & Acoustics Glossary
  2. Rapid Speech Transmission Index expressed in a decimal range of 0.2 for "bad" to 1.00 for "Excellent" Source: http://www.owenscorning.com/around/sound/glossary.asp

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