I bought a somewhat cheap 4.4mm balanced cable ($80) to use with my Fiio M11 and I really like the way the 2C sounds on it. The highs come through much more and have a nice crisp sound with really good detail, even more than my JDS Labs desktop setup. The bass doesn't have as much authority but still sounds very clean with a good amount of impact. The mids also sound nice and are very balanced as well. I'm really enjoying how the 2C sounds from the M11 and I wouldn't have thought it would sound as good as it does since it only has about 550mW at 32ohms but that seems to be plenty.