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The PC-580RU & PC-580RVU are designed to fill the need for a high-performance / low-cost ceiling speaker for paging and notification applications, especially where retrofit of speakers in large facilities dictate that a common speaker template is used, eliminating the need for adapting existing ceiling cutouts. The PC-580RU & PC-580RVU (along with the HY-BC580U Back can) meet UL requirements for speakers used in emergency signaling and notification applications.