Technically speaking, a subwoofer describes a loudspeaker that is specially designed to reproduce low-pitched audio frequencies known as bass and sub-bass, which are lower in frequency than those which can be generated by a woofer. Many vehicles use just a single subwoofer to enhance the bass, but this one went a bit overboard. So much so that they it apparently caused some destruction. Read more for the video.
Subwoofers typically have a frequency range at 20–200 Hz for consumer products, below 100 Hz for professional live sound, and under 80 Hz in THX-approved systems. They’re never used alone, as they are intended to augment the low frequency range of loudspeakers that cover the higher frequency bands. Don’t let the look fool you though, each subwoofer is made up of one or more woofers mounted in a loudspeaker enclosure, while active subwoofers include a built-in amplifier.