a large, box-shaped speaker black or grey a grille covering the speaker a power cord one or more inputs for connecting other audio devices a volume control knob or switch an adjustable bass control knob or switch a built-in amplifier.
subwoofer which is a large, box-shaped speaker subwoofer which has black or grey subwoofer which is a grille covering the speaker subwoofer which is a power cord subwoofer which has one or more inputs for connecting other audio devices subwoofer which is a volume control knob or switch subwoofer which is an adjustable bass control knob or switch subwoofer which is a built-in amplifier.