Yes it works. There weren't too much smoke actually. The part have different type of plastic than headphone's case. It's getting like coal after melded. And the only job is cleaning it with thin metal rod after that.
I just finished my k702 balanced mod. Thanks castigar. I never get brave enough for this operation if your guide does not exist. I melded existing mini xlr with soldering iron and it's easily leave it's place without harm around it. So there is no need to use brutal force if you don't care waste existing xlr jack. :)
I would like to try gain button time by time (different songs, headphones etc.). That's my personal choice off course, some doesn't. And new chassis looks nicest compared to old one. If I will use it for years, that is important to me.
I actualy try to ask coax input vs usb input in version A. My computer has coax out but I ordered version B. So is there any advantage using coax input (even from mainboard's sound card) compared to direct usb input? These are confusing my mind. There is a little price difference in both version, I know it. But my purse is already over discharged and every penny important now.