I have done very little experimentation with cables so far and only in my headphone rig since this is the rig I concentrated on in the past year or more. Initially my headphone setup did not justify investment in cables but after building up the setup I decided to replace my basic Radio Shock Gold cables with something hopefully better. After some research I have decided to get a pair of Outlaw cables. I have burned in the cables as many on this forum recommended. I experienced the burning deference in headphones and amplifiers before so there can be something to it. I just didn't have the time or the technical background to investigate this in depth.
Cables I compared (interconnects):
1. Some cheep cables
2. Some basic Monster cables I got long time ago
3. Radio Shack Gold series
4. Outlaw
Rig at that time: NAD 522, Creek OBH11 SE, Grado 325, Senn 580
Results:
I could not tell any deference between cable 1,2 and 3, but comparing all these cables to the Outlaw, there was definitely a small deference. It was not totally apparent on all recordings and all the time but I'm totally convinced it is definitely there. It was also more or less audible with varies combination of headphones and sources I tried.
Conclusions:
I definitely believe there are differences in cables even if the ones I have heard are very small. It is VERY dependent on the equipment used both quality and combinations, hearing ability and source material. I strongly believe (using pure logic) that the audible deference between cables will increase as the quality of the other components in the chain increases even if I can't explain it with measurements or scientifically. You can't expect to be able to hear the deference in cables if your equipment is junk. First invest in the other components and then try a few cables for your self. If you can tell the deference great if not then save your self some cash but don't try to convince others that what they are hearing is not there. I'm planning to do more tests, some blind, with the upgraded lineup of equipment I now have and few of my friends. Hopefully this will include sources, amplifiers, headphones, IC's, and speaker wire. Should be fun