LFE is "Low Frequency Effects" which has to do with non-musical low frequency like earthquakes, thunder, etc. I believe the way you have it set up, both music related and Effects related low frequency will be delivered.
Depending on your speakers you may use your sub for both music and LFE, or only for LFE. For example my mains deliver flat response to 20HZ, so my sub is configured strictly for LFE.
Depending on your speakers you may use your sub for both music and LFE, or only for LFE. For example my mains deliver flat response to 20HZ, so my sub is configured strictly for LFE.