Product highlights: 2-1/4" full-range driver for background music and customer paging voiced for tonal consistency with other Bose® FreeSpace® DS components multi-tap transformer with convenient thumb wheel for changing tap settings 70-volt taps at 1, 2, 4, 8 and 16 watts 8-ohm bypass for use with standard home stereo equipment frequency response: 95-17,000 Hz (± 3dB) sensitivity: 84dB mounting bracket with variable pitch and yaw included 9-15/16"W x 4-15/16"H x 4-5/8"D weight: 4 lbs.