After a couple of days I can tell for sure that the 600s sound slightly better than my old 595s (lasted 7!! years, now I hear more the left, probably because of the cable). I have tested them on the soundcore recon3d and on an old xfi elite pro. These headfones perform better on the xfi but I...

Thanks for your the answers. All my doubs have been disipated. I think I will test my hd 600s for a couple of weeks and then decide if I go for an amp or not.  

Hello I have spent a couple of days reading about headphones and amps. My old HD 595 is dying and I am looking for a replacement so I thought I could buy the HD 800 and "just plug it" into my pc. Then I realized that I was going to literally throw the money to the trash if I didn't pair them...