The
low-frequency effects (
LFE) channel is the name of an audio track specifically intended for deep, low-pitched sounds ranging from 3-120
Hz. This track is normally sent to a speaker that is specially designed for low-pitched sounds called the
subwoofer. While LFE channels originated in
Dolby Stereo 70 mm film prints, they became commonplace in the 1990s and 2000s in
home theater systems used to reproduce film soundtracks for
DVDs and
Blu-ray discs.