Definition of subwoofer noun from the Oxford Advanced Learner's Dictionary

 

subwoofer

 noun
noun
BrE BrE//ˈsʌbwʊfə(r)//
 
; NAmE NAmE//ˈsʌbwʊfər//
 
(specialist)
 
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a part of a loudspeaker that produces very low sounds
See the Oxford Advanced American Dictionary entry: subwoofer