What is the primary use of a subwoofer in an audio system?

The primary use of a subwoofer in an audio system is indeed to emphasize low frequencies. Subwoofers are designed specifically to handle the lower end of the audio frequency spectrum, typically from about 20 Hz to 200 Hz. By focusing on these low-frequency sounds, subwoofers enhance the overall audio experience, providing depth and impact, especially in music and film soundtracks where bass is crucial for conveying a full range of sound.

While other components in an audio system, such as tweeters and mid-range speakers, are responsible for higher frequencies and mid frequencies, the subwoofer's role is distinct. It adds fullness to the soundstage and provides a tactile sensation that enhances the listening experience. Therefore, its emphasis on low frequencies ensures that bass notes are strong and impactful, enriching genres of music and cinematic experiences.