'LF cutoff' sets the low frequency point at which the REW EQ optimizer stops trying to correct the EQ to the target curve settings. I played with them, and I see a difference in the target, but still not sure on what to put it. I get the cutoff, but what about the 'LF cutoff', 'LF rise Start & End' and the 'LF Rise Slope', for the moment, I just copied you but I'm not sure what they exactly, or to be more exact, how to use those to get what I want.