John, I decided to take another look at the HK635 manual. As usual, ambiguities and semantic subtleties prevail, but since I can even navigate the morass that is the Internal Revenue Code fairly well, I plunged forward. Beginning at the bottom of p.27 it says that when "large" is selected for the mains, a full-range signal is sent to them and that depending on the sub setting, bass and/or LFE may "also" be directed to the sub. The use of "also" implies that it can go someplace else too. Then at bottom middle of p.28 it says that when the mains are set "large" and sub "none", "...all bass information will be routed..." to the mains. So, it appears that it does work that way.
