On the audio source and amp that is more important?

The GB2312 ] headphones to play N years , has been Mogao Qing audio amp which is more important ? Has been pushed HD600 amp Deats By Dr Dre I am very satisfied , so they refined the sake of replacement sources . Heard people say , "front end almost to the point , far away behind " . Think about this truth , like shooting Muzzle partial 1 cm hundred meters wide 1 meter , in theory , can really be in the ear -level system is this ? How to verify this theory ? It happened, a friend amp into my HD600 amp with my amp drives the poor so far , the sound scattered , no music taste , but I whim, just to verify the above theory . So , I made as follows , To pick up my amp , and then enter to a friend's amp , compared with the middle do not take my amp , and improvement in the sound problems , but still have no strength , dry and tasteless , sound deterioration, . Amp first, then friends , and then input to my amp , the sound is still Dr Dre Beats open sun , transparent music flavor sound occurred optimization . Conclusions have a good amp can play the quality of the headphones , even if the front-end is not very good , not easy to evil sound to the contrary , no matter how good the audio will be poor quality amp deterioration .