Can you hear a difference when you reverse the cable direction?
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In many cables the shield that surrounds the hot and ground wires is only connceted at one end. There are two reasons for this, first, the shield should not be allowed to act as a second ground path, the difference in the potential of the two paths being a source of hum, and second, as this screen is designed to attract RFI and EMI before it reaches the hot and ground conductors the preamp is best dealing with these sources of interferance at its's output rather than tieing the screen to the input of the amplifier where it will be amplified.
A couple of years ago, A'Gon member Redkiwi stated that pretty much all wire is "directional" in audio, so prior to intstalling my ded. AC system, I decided to test that premise. I ran a 60 ft. 6 ga. stranded cable from my main breaker box to a submain. Well, direction "A" produced music that was very soft, dull, undynamic and in general "boring", so I switched direction and music was then much more normally live, natural, and dynamic. The difference was pretty dramatic. I was so amazed at this that the next day I repeated the test with the same results.
I have no idea why wire should behave this way (it was new, BTW), but there way no doubt about it, and I suspect that there is no way to measure what was going on. Neither do I know if over time the "soft" direction would improve with use. I had a job to do and a decision(s) to make. I'm sure you know what it was. But I will say that since that set of trials, I've become a strong believer in the directionality of wire, but an even stronger believer in the subjective nature of much of this hobby. There is a great deal about most sciences that is unknown. Cheers. Craig
Same for power cords. I have both a Vansevers 201 and 211 power cord. They are identical in every way, except for the wire runs in opposite direction from each other. The 201 is definitely warmer than the 211. The frequency extremes are a little more clear in the 211. (Basically the opposite of warm in the mids of the 201). Very noticeable between the two, with just a reverse of the wire.