Appendix H. Qualitative interpretation of Rw values
25 = Conversation level speech is easily understood
30 = Loud speech is easily heard and understood
35 = Loud speech can be heard but not understood
42 = Loud speech is heard as a murmur
45 = Straining is required to hear loud speech
48 = Loud speech is almost inaudible
50 = Loud speech is inaudible
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