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Woofer is the term commonly used for a loudspeaker driver designed to produce low frequency sounds, typically from around 40 hertz up to about a kilohertz or higher. It is named as a woofer for its low sound in contrast to the name tweeter that produces higher sounds. The most common design for a woofer is the electrodynamic driver, which typically uses a stiff paper cone, driven by a voice coil which is surrounded by a magnetic field. .
A subwoofer is a speaker that is designed to reproduce very low bass frequencies (usually those between 20 Hz and 125 Hz). These speakers tend to be large in size and require more power to operate than their small speaker counterparts. A subwoofer is used in order to provide the powerful audio rumble or punch commonly used in movies and music.
The picture above shows a woofer that has been upgraded to add better sound.
The picture above shows a woofer that ready for function inside of a speaker.
Image from: rodrigo senna
Image from: 91RS
