Originally Posted by pclov3r
Any comments on the Xonar DX?
You would only buy the Xonar DX if you were planning on using it with an external headphone amplifier.
The AKG K550 is fairly easy to drive.....but.
As The K550 is only 32-Ohms, you would want to only use the K550 with a headphone amplifier that has a very low impedance (Ohm).
Technically, you would want a headphone amplifier with an impedance of (4-Ohms or less)
(the line-out/headphone jacks on the XtremeGamer and Xonar DX have a high impedance).
The PAV2V external headphone amplifier ($70) could be used between the XtremeGamer and the K550.
(I believe the PAV2V has a low headphone output impedance)