I thought people may find this interesting. It's mostly for people that have a K702, but would apply to the K701 as well...
It seems like many people complain about the lack of bass on the K702 and K701. Then there is the issue of treble. As much as I love the K702, it's treble can be bothersome. I'm fine with the bass.
First off, recently I recabled my HD-650 and DJ100 with Canare Starquad cable. It added too much bass and rolled off the highs. Not a good match for these two headphones since they already have rolled off highs and more than enough bass. Adding these cables seemed to mess with the sound clarity on these two headphones.
I thought this Canare might be a good option for the K702. I can confirm that it's a great match for the K702/K701. It slightly tames the treble and adds a little warmth to the sound. There is also a bit more bass. The difference is quite large, but of course it doesn't make it bass heavy. Seriously, try a Canare cable and tell me if the K702 is still bass light! I never thought it was to begin with, but the extra bass is so nice.
Sadly, there is a bit of a loss of some detail, but it's not too bad. For lots of detail and a more neutral sound, I prefer the Mogami.
Best of all, to make a K702 cable it will only cost you under $20 including shipping. Making cables is quite fun. You need Canare Mini Starquad, a 3.55mm plug (1/4" is easier to solder), Mini-XLR plug and some heatshrink tubing. You can even get the cable in Smurf blue! That's what I'm using.
Of course if you don't believe in cable upgrades, feel free to ignore this.
I certainly do! Loving my HD-650 with Mogami and my K702 with the Canare!