I have my 1804 set with all speakers set to large and the lfe + mains turned on. I like the better overall sound that you get when you let the speakers decide what they can handle and the sub still works for the rest of what the speakers can't handle. It might be taxing the receiver a little but I prefer it this way. Play around with the settings while listening to music then with your favorite movie and decide what YOU like best and leave it that way. That is the joy of HT. Good Luck setting up.
