Hi, I recently got hold of a R-12SW to go with my R-15PM. So my sub is connected to the speaker with RCA/LFE. My question is regarding the setup of the sub to work in harmony with the R-15PM and I don't quite understand the Low-pass. Someone told me to just put it at max(labeled LFE), but couldn't explain any reason behind this suggestion. Does anyone have experience with setting up a sub like this together with my speakers ? I have a really hard time finding the right setting.