Case study reviewing the speech transmission index and voice intelligibility design and implementation of two atrium spaces where dedicated public address systems were implemented. The architectural design and selection of finishes has a great impact on the capability of any public address loudspeaker system distinct from any system performance characteristics. The presentation will review the design process, acoustical modeling, and testing results outlining the issues associated with meeting the NFPA 72 Common Intelligibility Score suggested goals. Architectural design requirements such as day-lighting and views are increasing large areas of glass in atrium spaces. These designs are making intelligibility increasingly difficult and the electronic systems and loudspeaker designs can only accomplish so much without architectural acoustical finishes as part of the design.