As in adding the DF to the XDP? Yes. The Pioneer is very good on it's own, imo. Hell, I don't even think the Mojo is necessary for the XDP audio-quality wise except for added "oomph" for specific headphones. DF and other portable dac/amp are good for "cheap" DAPs or mobile phones. Again, my opinion based on my usage. Afterthought adder: Also, introducing a separate DAC/Amp to the portable DAP will also significantly drain battery charge faster.