Thank you...it is always the same dilemma for me with some headphones, I have dedicated so much time to finding the best portable setups I can find that I really ignore desktop setups, I can't stand being tethered to a desk with an amp. I have had portable stacks, Mojo etc.. but it is difficult to carry a Mojo in your pocket when you leave the house and obviously exercising. So the dilemma is to be able to drive my HD6XX or Aeon properly, to the potential I can hear only from my underpowered sources, both being open headphones staying in or around the house with a stack won't be a problem. I have about an hour of listening time and it is requiring high volume but they are really nice. A smooth balanced sound with pleasant warmth. There is some nice bass rumble with some planar snap. Hiromi's piano notes sound live and very natural. I hear absolutely zero harshness in the treble. I need to A/B to see which stage is larger, it is not the the largest stage I have heard, but it doesn't really need to be, to compliment the entire sound signature, it has nice separation, but not real wide. Quick initial thoughts with no burn-in. A very pleasant experience, very.