Just a correction from what I said above regarding cables and the DXP. About 6 months ago I found that the following cable transforms these headphones from a little bit on the dark side to neutral perfection:
http://www.lunashops.com/goods.php?id=6520
This cable makes a huge difference, so much so that the DXP is now my reference headphone. Since I found this combination I've largely ignored my other headphones, as the DXP has the perfect tone without any faults. In my opinion this combination sounds far better than anything the Signature DJ or PRO's can produce. The Oyaide hpc-35hd598 is still the best cable I've found for both the Signature DJ and PRO's, but the DXP benefits
greatly from a pure silver cable.