i,m currently listening to my music via, igrago headphone's, pro-ject headbox 11 amp , and a denon m31 micro system, connected with qed interconnects. i'm really pleased with the results, because in an ideal world i'd obviousley like speakers aswell , but it's not feesable what with other people living at home. so what would a worthwhile step up be? i'm pleased with my headphones and headphone amp, but i fancy the idea of a new dedicated cd player, ie: the marantz cd 6002. will i be able to hear a worthwhile improvement over the denon m31? is it worth the upgrade? any advice would be greatly appreciated. also could someone tell me how the tone control works on a headphone amp, because it seems to be pre-set automatically. if i try turn up treble or bass with the denon i cant notice the change. cheers.