The BOSE's FREESPACE DS 16SE is a outdoor full-range surface-mount loudspeakers with exceptional performance for background music and speech reproduction in a variety of installation applications. This public address system has a wide coverage pattern of 170° x 160° with a frequency response of 80 Hz, and a single 2.25" (57 mm) full-range driver in a ported enclosure. Horizontal and vertical alignment is possible with adjustable pitch or yaw with the mounting hardware. An integrated multi-tap transformer is incorporated, featuring an ingenious thumb wheel adjustment for quick tap changes from behind the front end cap.