Many thanks. I think I will just buy a reasonably priced well constructed cable and be done with it. At the moment I am using a flimsy thin extension that came with an old pair of Creative headphones, and although it works I swear I can hear a difference but it might just be a psychological thing - highs seem to distort slightly compared to not using it - the sound is more harsh.
If its really, really, really thin (as in wire gauge) garbage quality wire, the cable may possibly may have an audible impact. In that case, I'd argue that you'd notice the attenuation of high frequency content rather than any distortion though. So I still don't think the overall impact is particularly significant.
If there is an increase in impedance due to the cable (possible), you'd probably notice a boost in mid-bass with your Beyerdynamic headphones. The Beyerdynamic headphones you own all have upper midrange / treble peaks and measured distortion around said peaks so maybe you noticed the issue on a bad day?
Anyone here use the HD800, and play some shooting games with it? If so, how do you like the sound stage?
Good but the HD800's strengths are in its sound signature. I haven't played many modern day FPS games but I've never found sound stage to be particularly important when I played CS 1.6 or Quake. Sound signature was always the most important thing to me.
The HD800 doesn't really have a bass emphasis and has a lift in upper midrange/treble would make it easier to notice sound cues. If you look at all of the headsets from AKG and Audio Technica that are often recommended for positional audio, they all have similar traits: not a lot of bass, upper midrange/treble emphasis, wide sound stage that is arguably exaggerated and unnatural but real easy to tell left from right.