Extra Internal Bracing ELAC's subwoofers are designed as the perfect complement to your home theatre system loudspeakers, adding a powerful bass foundation to music and soundtracks that turns your system into a sensation you can feel and hear. A subwoofer handles the lower frequencies or bass. It can also reproduce the LFE (low-frequency effects), also known as the .1 in a 7.1 system. Home theatre subwoofers are important because most speakers in an audio or home theatre system cannot reproduce all the frequencies your audio source sends to them. Without a subwoofer, you'll be missing out on some of the sound. The low frequencies also help produce the full, rich, three-dimensional effect we love in movie soundtracks and music.