Woofer is a term used to describe a type of speaker that is designed to produce low-frequency sounds such as bass and percussion. There are various other words that can be used to describe this type of speaker. One example is subwoofers which are similar to woofers but are specifically designed to produce extremely low-frequency sounds. Bass speakers is another term that can be used to describe woofers, whereas sub-bass is a term used to describe a speaker that produces even lower sound frequencies. Other terms that can be used include low-frequency drivers and bass bins. Ultimately, all of these synonyms refer to a speaker that produces deep, low-frequency tones.