@fleschler
After replacing all six power cables, he admits that scientifically it is unexplainable but the difference exists.
Science trivially explains that. You mad a change, he listened more carefully and now he "heard" more detail, air, etc. Nothing had changed in the sound. It was him that changed because our hearing is elastic and 2-way. A comparison causes our brain to work differently and hence we perceive things differently.
We prove the above two ways:
1. We test the person blind and repeat at least 10 times and see if he gets > 8 right. Every audiophile tested this way has failed to hear the same differences.
2. We perform measurements to see if there is a difference or not. If nothing has changed in the waveform coming out of your audio device, then your listening test protocol is wrong.
All of this has been known for decades. But some audiophiles refuse to believe it. No amount of explaining the simple facts of how their perception works makes them change. They go on wasting money on useless audio product after useless audio product.
I have tested a number of digital audio cables by the way. The last one was the $1,800 Nordost Tyr 2:
I also performed listening tests and found no differene.
Before you come back and say you can hear what I can't, turn on a video camera and perform the AB test and repeat 10 times randomly. Unless you can show this, you have no case. None. You are simple unaware of how your hearing and perception work.