[atl5]

Well, the headphones are a Grado SR80 and a K702.
 
Quote:

I don't know what the Xonar DG's power or voltage output is. The PA2V2 only says "up to 200 mW", which could mean a lot of different things depending on output impedance and at what load impedance that number was measured. If I generously assume it has a 0 ohm output impedance for simplicity, and assume that was measured with a 16 ohm load, that's about 1.8 Vrms.
 
Now all we need to know is what headphones you're talking about.

 

 

[Head Injury]

The PA2V2 is plenty for the Grado, maybe not enough for the K702 depending on how loud you listen.
 
But I suppose that also depends on source voltage. What do you plug the PA2V2 into?
 
I don't know what the PA2V2's gain settings look like. If they're going for 2 Vrms it might just be 1x gain.

 

[atl5]

Using on a laptop now with a realtek HD soundcard.  If it does make a difference, I was gonna put the Xonar DG in my Desktop with a Intel 2500k chip.