To me, the SR225 has clearer, more realistic sound than the SR60. I am listening to Badi Assad, a Brazilian classical guitarist/singer and on her song "Waterfall", there is a part where water is, uh, falling, and on the SR225, it really sounds like water, on the SR60, though it would sound good if I didn't have the SR225 for comparison, the falling water sounded more crackly and electronic, though, I repeat, this conclusion was drawn after comparing the two 'phones side by side, playing the piece over and over again. The difference is subtle to my ears, though some of the more expericed headphone addicts here would undoubtedly find the distinction dramatic.
Another way to put it: all the sound and instruments are there on the SR60 but it is easier to pick out the indivdual instruments on the SR225.
The length of the cord from the bottom of the headphone to the tip of the jack is 7 feet on both models.