A subwoofer is a specialized speaker designed to reproduce low-frequency sounds, typically below 200 Hz. These sounds include bass notes in music and deep rumbling effects in movies, enhancing the overall audio experience. Subwoofers are commonly used in home theater systems, music setups, and car audio systems to provide a fuller sound. Subwoofers come in various types, including passive and active models. An active subwoofer has a built-in amplifier, while a passive subwoofer requires an external amplifier to function. They can be found in different sizes and designs, allowing users to choose one that fits their space and sound preferences.