Headphones are very sensitive to the quality of the input. Less than great electronics and great headphones and you are going to hear it.
I now have about $15K of incredibly naturally sounding electronics behind my headphones… they all sound fantastic… Focal Utopia, Sennheiser HD800, Beyerdynamic T1, Audiez LCD, Ultrasond Edition 9, and Denon 5000 (?)… etc. You can see my headphone system under my user ID.