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 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.