The Role of the Woofer in a HiFi SystemA good HiFi woofer can make the difference between a flat sound and an immersive audio experience. The low frequencies that a woofer produces contribute to the realism and emotion of music, films or other audio content. Without good bass reproduction, the sound sounds thin and lacks depth. In a HiFi system, the woofer can be built into a speaker cabinet or placed as a separate subwoofer. Subwoofers are specially designed to reproduce very low frequencies, often below 100 Hz. When combined with a good woofer and other speakers, a subwoofer can produce even deeper bass, making the sound more impressive.