My current setup is:
Radeon hd6770 graphics card connected to PC Monitor(full hd LG) via hdmi cable. My Sr60 are connected to PC Monitor.
Spec. of video card:
Integrated HD audio controller
Output protected high bit rate 7.1 channel surround sound over HDMI or DisplayPort with no additional cables required
Supports AC-3, AAC, Dolby TrueHD and DTS Master Audio formats
I was thinking about upgrade for my headphones, but i have no idea if buying for example Audiotrak Prodigy Cube Soundcard will be any improvement over current setup i have.