The sound signature is somewhat U shape but the mid forward and clear. The bass is tight and impact full and the treble has a nice sparkle. The presentation is also very good for a close back. The soundstage is over average for a close back.
You can find an interesting review here http://www.head-fi.org/t/541654/denon-dn-hp700-review-and-comparison-to-the-ah-d7000