[carsonson]

Gaming:
Xonar DG(front panel) ---> Headphone
 
Music:
Xonar DG (optical out) ---> DAC ---> Amp ---> Headphone
 
Movie:
Xonar DG (RCA Out) ---> Logitech 5.1 X-540 Speakers
 
are there any problem for my setup??

 

[PurpleAngel]

Quote:

Gaming:
Xonar DG(front panel) ---> Headphone
 
Music:
Xonar DG (optical out) ---> DAC ---> Amp ---> Headphone
 
Movie:
Xonar DG (RCA Out) ---> Logitech 5.1 X-540 Speakers
 
are there any problem for my setup??

No problems with your setup.
 
The Xonar DG "might" be able to output (PCM) Dolby Headphone surround sound thru the optical output (maybe).
I know the some of the more expensive Xonars can.