As one of the first owner of DP-X1 here, I was telling people that there isn't any Qualcomm DAC but only apps that either can utilize it properly or not but i guess this new Android based DAP territory is still quite a no man's land.
The DAP audio chips are native for Android. The only problem occurs when, like in the case of V10, there is a default DAC along with the HD audio one. Since you're saying there's no Qualcomm DAC in DP-X1, this is a non issue.If you hear sound, the chip is being used. Make sure the software is setup properly so there's no up or down scaling.