I need to know what is the difference,in the setup menu of Marantz 5400,whitin step N°2-3(Speaker setup/Speakers level)and N°4(surround). In both menus, the levels for center,surround L&R,Surround back and SW are available for adjust dB. In fact,when I choose a level in one of these menus the other automatically self adjust at the same level!! Does anybody know why? Thanks in advance