[DaWolf1205]

I'm running an Asus Xonar DSX with a dual LME49990 amp chip. My HD558 got damaged and I wanted to replace it, so I bought the AD900x, but I'm wondering if I could have made a better choice. I'm willing to spend a bit more money if it'll be worth it.
 
I'd like to buy another Sennheiser because I loved the way it fit over the ears, so I'm thinking of returning this AD900x but I don't know which Sennheiser I could purchase. I'd like to buy something even better than the HD558/598, if my sound card can take advantage of it. I'd also like to know if replacing the AD900x with the AD1000x would be worth it.
 
I mostly listen to instrumental music, and I'm going to be using these headphones for gaming and watching movies as well.
 
I'm interested in hearing some of your opinions.

 

[PurpleAngel]

The Xonar DSX is decent at driving headphones, but I believe it has a high impedance output
And limited in the range of headphones it could drive.
 
I would think the AD900X is a decent upgrade, for music audio, over the HD558s.
A headphone amplifier with a low output impedance (connected to the DSX), like the Schiit Magni ($99) or O2 might help bring out better "detail" in the audio.