An interesting read:
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Can We Hear Differences Between AC Power Cords?
I have no time to read the whole article just now, but here is my reflection to the conclusion:
"Using the blind ABX protocol, we failed to hear any differences between an assortment of generic power cords and Nordost Valhalla."
Oh my god, why couldn't they hear any differences between these cables. Probably they did the test the wrong way, too much time between the cable changes.
"Unfortunately, as John notes, we don't know of a way of accomplishing fast power cable changes, since, unlike interconnects which can be simply switched between A and B with the equipment all still powered on and playing music, changing AC power cords requires turning the equipment off, switching the cords, and then powering them back on."
OK, I understand now. They had the wrong method which takes long time.
It's very easy to change power cable during playing the music with my method. Im using a Musical Fidelity X-Can v8 tube headphone amplifier with Sennheiser HD-600 headphones. I can change the power cable very fast during the playing of the same record, and the difference I can hear immediately. I tested and compared this way Supra LoRad, Van der Hul and Audioquest power cables. There is a big difference between them.
hifi_fan