After ten days I finally got a reply from Pioneer as to what a "Low Cut Filter" is... Seems kinda vague to me, are they just talking out their buttholes? Here's what they said... If anyone can explain this to me better, please do. [The low cut filter is a process of adjusting the very low frequencies which can cause distortion to the subwoofer depending on the source, the size and power of the subwoofer also the setting of the crossover frequency mode. It is not a matter of "how much" or "how low" of a frequency will cut (how low is done by setting the crossover frequency mode): setting low cut filter "on" will adjust accordingly the low frequency sound to always stop or reduce to maximum possible the distorted sound on the subwoofer. The LFE is a similar process but this one eliminates or reduces the distorsion created by ultra low bass tone to all the speakers not just the subwoofer. The "* * " sign indicates the LFE being "OFF", the "0 dB" (zero decibels) which is the default setting for LFE and for each speaker in "test tone " level, means the attenuator works best at 0 dB volume.] level, 10 dB means the attenuator reduces best the distorsion at 10 dB.