speaker unit

Từ điển WordNet v3.1 - WordNet Dictionary

noun

electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
• Syn:
loudspeaker, speaker, loudspeaker system, speaker system
• Hypernyms:
electro-acoustic transducer
• Hyponyms:
bullhorn, loud hailer, loud-hailer, squawk box, squawker,
intercom speaker, subwoofer, tannoy, tweeter, woofer
• Part Holonyms:
public address system, P.A. system, PA system, P.A., PA