Soundtube CM52-BGM-WH 5" Coaxial Ceiling Background Music Speaker (White)The CM52 BGM is a 5. 25 inch coaxial two way blind mount in ceiling speaker which delivers true high efficiency and performance across the operating bandwidth. By incorporating a 5. 25 inch polypropylene driver with a rubber surround and a 0. 75 inch silk dome tweeter in a drawn steel backcan with a tuned port, this speaker delivers maximum frequency response (65 Hz 22 kHz, 10 dB) in an integrated enclosure design. Mounting hardware is included and