My test involved switching my "reference" phono cable and and my "reference" interconnect. (My speakers are active, I do not use speaker cables.)
Both cables were switched out at the same time(or not). I switched the "reference" Phono with a cheap Monster Reference, and the "reference" interconnect between preamp and active speaker amp with the same Monster reference cable.
I did 10 switches a day over five days. I did not switch the cables myself, and was not told which cables I started with. I was not trying to pick which one I liked best, but I was trying to name which cable were playing. I left the room for about 1.5 minutes exactly while cables were switched or not switched. The minute and half might have been my issue.
The results: I answered right 27 out of 50.
Why did I take a test after purchasing instead of before? Actually, before purchase I did switching myself. The power of marketing, placebo, suggestion, you name it is very prominent in the results, I now think.
I could not be happier that I "failed", by my own standards.
Now others are welcome to point out the flaws in my DBT's but it will go in one ear and out the other. Because what I did learn personally is if their is in fact a difference identifying it reliably is beyond me and MUCH MUCH MUCH more difficult then I had been "marketed" to believe. My feeling is if "I" need a perfectly executed scientific experiment to discern the differences, then I will look elsewhere for system improvements.
Others please respond with your own results not "hyperbole"
I have no vested interest, I am just curious...
I am not trying to shift anyone's mind. I have voted with my own pocket book, both ways to the extreme and have moved on.