Dunno man, have used my HD600's directly out of my craptop's headphone out and they still sound like HD600's... Somewhat underpowered, loose, and unrefined... But not too bad.Now try using a pair of United Airlines free-cans out of your Pico, or for that matter any Dyna-low/mid/high, B22, O2, or whatever...The cans matter... A lot IMO. The Abyss deliver. Expensive n ugly? Perhaps. Depends on ones sense of fashion. Mod the headband then. They do sound good tho.