First off I will say that Im not 100% keen on the stock HD600 cable.
Im not sure of its sonic capabilities as I dont have the 600's.
However my MDR-SA5000's were recabled with the HD600 stock cable by the previous owner...
I find the build not so great compaired to lets say the stock HD25 cable. Not the best made stock cable in my eyes.
Reasons for re cabling can be varied,
For me, Im changing my HD25 to a White Widow because I want/need a balanced output, And I love the workmanship and quality of
I also am one of the crowd that DOES notice a difference in sound. As my IE8 Silver Poison has shown me. Its made a huge difference over the
stock IE8 cable in the sense that the IE8's now sound less muddy/boomy, The bass is tighter and more controlled and the highs are crisper with better detail without
being too bright.
As for my Beyer Hybrids Im making, The stock DT531 cable is ***** so I want something that will withstand a fare amount of punishment and look damn sexy at the same time.
The Sony MDR-SA5000's will be redone as obviously Ive stated I dislike the HD600 cable.
Hope this helps a little?! :)