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Can the Fiio K3 drive this 6xx well ?
If I'm not mistaken, the Fiio K3 is a usb powered unit? Here's my experience with usb vs wall powered. A usb powered unit can make the headphone's loud enough, however there are usually two issues with it. "Loud enough" is subjective and I personally felt that I always wanted more volume. The other issue is that depending on how good the unit is, sometimes, turning the pot all the way up towards max or past 3/4 o'clock can lead to distortion. I've currently swapped out my uDac (usb powered) for a JDS atom and well, the atom definitely provides more than enough power for my headphones.
In short, it's up to you. I would personally suggest buying a powered amp or powered dac amp combo but at the same time, a usb unit might be "loud enough" for you.