Suitable for use in car or home theatre system, a subwoofer is designed to produce impressive audio for rumble/punch that is used in movies or music. It is nothing but a speaker that reproduces very low bass frequency and is usually big in size. With the ability of catching punch in small areas, subwoofers have become increasingly popular to create a theatre like ambience at home. However, there are many different sizes of subwoofers available which can be even mounted depending on your choice.