The low-frequency effects (LFE) was originally developed to carry extremely low "sub-bass" (which starts around 60 Hz and goes down to about 20 Hz, and people often feel them more than hear them) cinematic sound effects and in the layouts of the standard speaker channel, five systems do not have LFE while only three systems have LFE.
Sub-bass sounds are the deep, low- register pitched pitches approximately below 60 Hz (C2 in scientific pitch notation) and extending downward to include the lowest frequency humans can hear, assumed at about 20 Hz (E0). In this range, human hearing is not very sensitive, so sounds in this range tend to be felt more than heard. It was originally developed to carry extremely low "sub-bass" cinematic sound effects (with commercial subwoofers sometimes going down to 30 Hz, e.g., the loud rumble of thunder or explosions) on their own channel. No No No No No Yes Yes Yes 
