A
subwoofer (or
sub) is a
woofer, or a complete
loudspeaker, which is dedicated to the reproduction of
low-pitched audio
frequencies known as
bass. The typical frequency range for a subwoofer is about 20–60 Hz for consumer products, below 100 Hz for professional live sound, and below 80 Hz in
THX-approved systems. Subwoofers are intended to augment the low frequency range of loudspeakers covering higher frequency bands.