So the good news is that you can hook it up, the bad news is that I am not confident that it is a good idea. Looking at your back panel you have stereo out to zone 2 and 3 but I am not sure if that is passive (pre amp) or powered (amplified signal). It can work either way but you run into the issue of pushing to much signal to the dac and killing it. On a side note, you may want to look into whether or not you get signal at the xlr port from the rca inputs. I say this because I know some DAC/Amps, such as my SMSL sAp9 do not cross feed signal from rca to xlr and xlr to trs. For the record, I am not sure if your dac is any better than the audio you will get from the amp itself as it a home theater amp and is in a sense a DAC itself. I could be wrong (and lord knows I have been many times in the past) and I know I have heard of people doing what you want to do but I am not completely sold on the idea that this is going to bring anything to the table audio wise that you will just get from the amp itself. I hope I was of some help and will try and help you as best I can with any other questions you may have. I have a lot of experience with home theatres, and a lot of experience with with DACs AMPs and headphones but I don't have much by way of putting them into one system. Again, I hope this helps and if you do run stereo rca from the amp to the DAC/AMP, make sure you have the volume on the Pioneer turned way down before selecting that output in the pioneer. Just a good practice to keep from killing the dac/amp and or your headphones.