Try Headroom at www.headphone.com. If you are interested in more stuff headphone-related, go to www.head-fi.org. You'll find reviews of the Clou, Cardas, and Equinox replacement cables for the Senn. hd 580/600.
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I found this on the Sennheiser website (which is not that easy to navigate) as an accessory for HD580:
“Replacement Cable with PX-4G adapter"
The URL is
or, if that does not work, start at
www.headphone.com has excellent service. I ran into the same problem with my 580's. I purchased clou cable red jaspis'. The good news is that they are very tough, well constructed, and do sound noticeably better. The bad news is that the cable is considerably larger (about 3/8" thick), bright red, and a little stiff. A worthwhile upgrade overall.
Sonically, there are two replacement cables (Cardas and Equinox) that are superior to the Clou, and way superior to the stock cables. Also, both are much more flexible, mechanically, to the Clou (with an edge in this department to the Equinox).
Personally, I like the Cardas - and it's the one I bought. It's a little more extended treble than the Equinox... but the difference between the two is distinctly smaller than the similarities, relative to the other choices.
Good luck and good hunting...