I'll try setting it 100/100 on Windows and Xonar, but as for using the 2v line output, how do I go about doing this?

So, I recently just purchased a Magni 3 Along with some DT 990s (250) and for the DAC, I'm using a Xonar DX. So, the thing is, they sound amazing and all, but is it normal to be able to max out the Magni on Lo? I mean, they certainly get kinda loud, but just barely. Is that normal? Now, I know...