High quality extension cable jack 6.35mm

Wanted was an extension cord for my Beyerdynamic DT 440 Edition. I have the cable has not been directed not from here, I have found no quality cable (the Rezesionen after) after several searches and on this. In some cases the prices known manufacturer of high-quality cables are so high that I already felt dizzy.
I then came sometime on the idea to look at the manufacturer of my headphones even after a cable (I would much sooner to make :-P). Since I live near Heilbronn and Beyerdynamic have right in front of the door, I'll be right over and got the cable picked up directly at the plant sale.
In the cables sold by Beyerdynamic is this copy of Klotz ais What more could you: a high-quality cable of a manufacturer who knows his stuff, and the whole thing made in Germany. Because I know that at Beyerdynamic exclusively audio purists work, you can / I also assume that they offer not a bad cable in their accessories. However, since not being able to buy directly from the manufacturer at any opportunity, I hope to be able to help with the evaluation. (Info: Here can be seen on the website of Beyerdynamic only the 3m cable)