Guys, thanks a lot for your help. I listen to almost everything, from classical to jazz, from pop to rock, from easy listenning to alternative... and yes everything is set properly, but will do a revision.
My room is not bad at all, but i'm gonna consult an acoustic specialist about this. My previous source was a Marantz SA7001, and now everything sounds globally better, but i would say that the main issues that i dislike, are about the same. I made this change so i could use the "external dac feature" from the audiolab.