LPF= Low Pass Filter?

My Denon has a LFE setting seperate from the crossover and I seem to remember reading it is recommended to run that one around 120hz, just in case the sound engineer added some LFE that high up in the range and small speakers wouldn't do it justice so it then is routed to the sub.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70