speaker unit vs speaker system

speaker unit and speaker system both are nouns.

Word	Noun	Adjective	Verb	Adverb
speaker unit	Yes	No	No	No
speaker system	Yes	No	No	No

As nouns, speaker unit and speaker system are synonyms defined as:

speaker unit and speaker system: electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance

Other synonyms of speaker unit include loudspeaker, loudspeaker system, speaker.

speaker unit (noun)	speaker system (noun)
electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance	electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance