noun
speaker unit; loudspeaker driver
Refers to the individual driver component (woofer, tweeter, etc.) within a speaker system, not the entire speaker cabinet.
このスピーカーユニットは高音域の再生に優れている。
This speaker unit excels at reproducing high frequencies.
Variant with interpunct; less common in running text.
スピーカー is the general term for a loudspeaker (the whole box), while スピーカーユニット specifically refers to the driver component inside.
Wasei-eigo (Japanese-made English) from 'speaker' + 'unit'.