1. The best thing ever invented.
2. A speaker that varies in size usually from 8" to 32". The most popular size is 12". They are made to put out the low end of the audio spectrum. They make the low end a.k.a. bass
more noticeable and louder and smoother. Playing them loudly is also known as subwoofing
, and if your not careful about where you do it, it will make other people mad. Subwoofer's are a great way to attract someone's attention, but just keep in mind thats not always a good thing.