Minimum Speech Transmission Index measurement is now a requirement for Emergency Communication Systems as set forth in NFPA 72 2013 code. Professional audio design engineers have the greatest effect on potential intelligibility through their choice of the type, number, and distribution of loudspeakers and the power at which they are driven. Design Engineers often model sound systems for STI using EASE. Using this STI modeling approach can lead to varying results especially in reverberant sound fields. This brief discusses the conflicting results of three design/build projects in highly reverberant spaces in the Federal Plaza in Chicago.
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