Peter ,I didn't mean to sound "snippy". I misunderstood your meaning of "looking" for a difference".The tests were done with 4 brands of interconnects of both optical and coax (of each brand) in both stereo and 5.1 channels, ranging in price from $1-200. I was able to A-B both types without any knowledge of which cable I was listening to. The switching was done by a third person who kept notes. I did this first alone and then with three other people. One was a audio engineer, one a professional musician, and the third an "average" person" with no particular audio interests. All parties picked the same two cables as their choice. One cost $100,the other $130. This procedure clearly could not follow the scientific method and has many possible flaws, but it was about as unbiased as people can get under the the circumstances.To my surprise these results were very similar to the subsequent Home Theater article mentioned earlier.This was repeated 2X with similar results.