I tried all the settings. Once when turing on for a fresh listen, I found the sound to be center-heavy and perhaps, not as clear. Iwent through the settings and one just opened up the stage, clearing up the problem for me. I can't quite tell which crossfeed setting is on but I sure know when it's off. Not a big fan of crossfeed yet.
Same here, if there are not much difference, I would rather turn it off to save battery life.