I own both K7XX and K702. I do not agree than the 'phones are essentially identical, sans the pads. At all. My feeling is that the K7XX uses drivers similar to the K712, albeit not as well-matched. FWIW, after a time I did the bass mod on my K702 and love it! Haven't felt the need for any other alternations; they're my favorite cans. Haven't done a thing to the K7XX. To me, they're fine as they are, albeit slightly less resolving in every way compared to the K702.