I'm using the CSB ZxR with my Beyerdynamic DT 990 Premium 600 OHM Headphones and they sound great and can get really loud with no issue. great pre-sets for FPS gaming and more. I don't regret'em at all. I did get the at over $50 cheaper but it was a once in a life time thing and i would gladly pay $175 over the $250.