Lissnr, I've done that test. I have bought several very expensive power cords to try with my amps, preamp and soucrces, and there was no apprciable improvement over the first level of cords I had bought. None at all. So about $2000 worth of cables replacing my modest cables, and no improvement at all.
I put the Signal Cable cords back into play, sold the other power cords and I was very happy. Were the signal cables an improvment over the stock cords? Yes they were, but after getting a dedicated line put in, with a PS Audio Soloist wall socket, PS Audio Duet conditioner for my amps, and an APC S15 for all the other gear, my power situation is great. All I needed was a conduit to get to those nicely designed circuits.
I once again contend that I have never heard any super high end power cord that made much if any difference over the first level of after market cords. Clean the power first, as everyone does, then get it to the very nicely designed circuits.
Avoid the MAGIC cords.
I put the Signal Cable cords back into play, sold the other power cords and I was very happy. Were the signal cables an improvment over the stock cords? Yes they were, but after getting a dedicated line put in, with a PS Audio Soloist wall socket, PS Audio Duet conditioner for my amps, and an APC S15 for all the other gear, my power situation is great. All I needed was a conduit to get to those nicely designed circuits.
I once again contend that I have never heard any super high end power cord that made much if any difference over the first level of after market cords. Clean the power first, as everyone does, then get it to the very nicely designed circuits.
Avoid the MAGIC cords.