Audio Few doubts related to Xonar DX

I have recently bought an Edifier DA5000Pro along with Asus Xonar DX.
Now, i have noticed that the difference in sound quality of both my onboard as well as the soundcard are approximately same, and the xonar feel a bit low in amplification of sound.

I experienced the same with my ATH M50 as well, even my macbook air provider better amplification on them.

Is there some tweak i can do to make it work better or there is some problem with my card?

Secondly, will the card make my speakers surround or there are some special other speakers?
 
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