To answer the original posting about the Q701. The X3 delivers more than enough power reserve to drive the Q701 as it does with the K701 and K702. As for how it sounds, I am still working on the Real World Review of the Fiio X3 and the headphone I chose to setup for the review is the AKG K701. The original K701 has an exceptionally balanced sound thus it provides me with the details that I can say that will define the review. Please stay tuned for the review for where I will post the link to in this post.
"The Audiophile World" at yklee118.blogspot.com