loudspeaker

noun

1. An electromechanical transducer that converts an electrical signal into audible sound.

   “Unintelligible announcements on station loudspeakers are both irritating and confusing.”

   “Beijing itself signified the transformation. When I visited in 1979 it was a grim city where every pedestrian dressed in a drab gray Mao jacket and every street corner had a loudspeaker repeating the sayings of Mao. The city was desolate and joyless.”

2. Any such transducer that is loud, as opposed to quiet ones such as those found in headphones.
3. An encasing containing one or more loudspeaker devices and usually other electrical equipment such as a driver.