Answer: loudspeaker

AnswerCrossword Clue
LOUDSPEAKERStereo part
LOUDSPEAKEROne may be put in the corner of a classroom
loudspeakera device that changes electrical signals into sounds loud enough to be heard at a distance
loudspeakerAn apparatus that converts electrical impulses into sound, typically as part of a public address system or stereo equipment