Since the 880 600 ohms are semi-open, the bass is naturally not going to be as heavy as the closed 770 600 ohms. The 880 has good bass (significantly better than the K702). The 880 are an all-around good can with amazing body, great vocals, and are as crisp as they can get without inducing sibilance. The 770 600 ohms are a bit boomy, but I like it because they do not sacrifice any other part of the spectrum to achieve such tight bass. The mids are not recessed, and the highs can get a little edgy with genres that have artificial highs.
You think the 770 600 ohms have a veil? In which part of the spectrum? Actually, I found that there was slight sibilance when listening to pop with these 770 600 ohms. I hear no veil. I have not heard the 80 ohms version, however. Do you mean the DT880 Premium 600 ohms? I didn't know they made a pro version that with 600 ohms.
Edited by KB24 - 8/5/11 at 7:26am