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|Noun||1.||speaker unit - electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance|
electro-acoustic transducer - a transducer that converts electrical to acoustic energy or vice versa
P.A., P.A. system, PA system, public address system, PA - an electronic amplification system used as a communication system in public areas
subwoofer - a loudspeaker that is designed to reproduce very low bass frequencies
tannoy - a loudspeaker
tweeter - a loudspeaker that reproduces higher audio frequency sounds; "the sound system had both tweeters and woofers"
woofer - a loudspeaker that reproduces lower audio frequency sounds