That is normally a sign of a well implemented cross-feed. Its effect will only be noticed once you use it for long. Test it: Play your favourite album from start to end using one of the setting, than play it second time immediatly turn off the cross-feed, you will notice the change.
Most cross-feed that change the sound right away will sound artifical in prolong usage.
Edited by audionewbi - 4/20/14 at 9:36pm