A subwoofer (or sub) is a loudspeaker designed to reproduce low-pitched audio frequencies known as bass and sub-bass, lower in frequency than those which can be (optimally) generated by a woofer. There are no stark differences between these two speaker systems as both are used to reproduce low-frequency sound notes. Subwoofers are designed to reproduce... 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. While subwoofers are all but required for home theater, the role subs play in music systems is almost as crucial. ... Adding a sub to larger speakers also makes sense -- in fact, all but the most humongous speakers benefit from adding a sub. Here's the best part: Adding a sub isn't just about more bass.
