A very simple version of this test would involve a CD player with a digital output and one of the DSD capable HD recorders from either Korg or Tascam. The CD player will digitally output to the DSD recorder and the test will be of three different power cords - stock, mid-level and SOTA. We can have a PC manufacturer suggest and supply the cords. The questions about break-in, settling-in or warm-up can be dealt with by having the power cords fully broken in on external cable burners and attached to the CD player for an arbitrary time period, say 72 hours, before recording. The music to be recorded should be the same for each power cable and I would suggest at least 2 hours of recording time for each cord.
Once the three separate recordings have been made you can now play them back and see if you hear any differences between the recordings. You can playback long sections, short snippets, mix and match, play at random, repeat play sections over and over, etc. and see what you hear.
As you can see, this is a simple setup, but it is scalable if you want to test larger equipment systems. I would even think that if you took the time and effort you could design a test along these lines that would optimize which power cords to use in your system, excepting power amps or speakers that require AC.
If you see holes in what I propose, then tweak it, for I think Pcoomb's basic concept is sound.
Once the three separate recordings have been made you can now play them back and see if you hear any differences between the recordings. You can playback long sections, short snippets, mix and match, play at random, repeat play sections over and over, etc. and see what you hear.
As you can see, this is a simple setup, but it is scalable if you want to test larger equipment systems. I would even think that if you took the time and effort you could design a test along these lines that would optimize which power cords to use in your system, excepting power amps or speakers that require AC.
If you see holes in what I propose, then tweak it, for I think Pcoomb's basic concept is sound.