How does cable construction affect sonic character?

It's an interesting topic to me. It's almost like discussing religion with someone you don't share beliefs with. Our experiences inform our opinion. If a cable produces a different perceived sound effect than another cable, and both cables measure perfectly according to standard practice, that creates a great deal of interest on my part, and a desire to better understand what is happening. The first thing I want to do is verify that I'm not experiencing a psychological effect from knowing things about the cable's cost and construction. When I've perceived distinct differences between cables I've found ways to listen without knowing for sure which cable I was listening to. To my utter astonishment the difference was no longer apparent when I did that, even though the setup hadn't changed at all, just my uncertainty about which way the selector switch was set.  I've had similar experiences with equipment break in. On one occasion I bought two identical amplifiers and realized I had an opportunity to test break-in effects. I listened to both of them at the start. They both sounded the same. Then I used one for a month, listening for a few hours every night and running pink noise through load resisters for the rest of the time. So the amp ran 24 hours a day for a month straight. At the end I was sure the amp sounded better. I then plugged in the other amp that hadn't been used and it also sounded better in exactly the same way. That taught me what was really breaking in.  I'm not insisting that these examples describe all the differences people perceive but I do think they represent something that is happening a lot of the time. Our sense of sound quality can be powerfully altered by means other than actually changing the sound. At least for some of us that is the case. I have yet to see any solid evidence that the standard accepted set of audio and electrical measurements are inadequate to account for perceived differences in sound quality, but I remain open to new discoveries. One thing that I feel is important is to compare measurements of a speaker's actual sound output when different devices are inserted into a system. There may be interactions between  components that create unexpected issues. This is difficult or perhaps impossible to thoroughly test with all possible component configurations. I'd want to test specifically in configurations where a perceived benefit is noted. My suspicion is that it's not the most accurate and stable systems that reveal differences in components best, as is often suggested.  I also suspect that there are intermittent issues, especially with digital signal paths, that can go undetected in a standard test bench procedure. Recently my friend got to hear distortion in my system that I hear once in a while. He's not an audiophile at all but when that distortion starts it's obvious. I have to reset the digital interface to make it go away. I suspect that more subtle intermittent distortions may also occur. 

@hilde45 -

     Back in March a thread about power cords and break/burn-in was started.

     I hate to type, so: I'm going to copy/paste some of my speculations.

     That a highly complex musical signal, MIGHT affect Poynting vectors and signal speeds, in interconnects, in a much more profound manner than a simple AC (ie: a fixed 60/50 Hz) signal, in a PC, seems likely (at least) to me.

     Further: all of the above and what I'll c/p (seems to me) lends credence to how the application of a stronger, DC voltage/field, outside a dielectric (ala Synergistic MPC and Audioquest DBS systems), might stabilize those vectors and signal speeds, PERHAPS eliminating some time smear and, "burn-in". 

rodman99999 5,456 posts 03-31-2022 at 12:13am  @holmz-       Bear with me a minute, in my folly, far as a possibility on why a power cord might make a difference.       Based on some of the theories on how electricity works, simplified:       The conductor acts as a waveguide for the signal/voltage.       Within the conductor: when excited by an AC current, electrons oscillate, generating photons/electromagnetic waves that travel, always from the source, to the load.        Keep in mind: all signals (ie: music, AC) are sinusoidal  waves        Those photons/electromagnetic waves travel through and outside the dielectric, which (according to it's permittivity/Poynting vectors) will have various effects on those waves.    One of the most obvious, is the dielectric's effect on the speed of the signal.       The better designers of printed circuit boards, even take the above into account, when choosing materials for their products.        I posted a link on the first page, that included data on the manufacture of semiconductor chips and what was observed when materials were cryo'd, during process.     Short version: better contact/lowered resistance between layers.           Under the scanning microscope: much smoother surfaces observed.        I would hope, by now, it's a given that various cable constructions, twists, braids, etc, can make for a cleaner transmission of signals (ie: Litz, etc).                     Just seems to me (a hypothesis): given the above (some theories and some things established/measured/proven), it's not a big stretch to believe a power cord, built of the best conductor (Ohno CC silver), wrapped in a very low dielectric coefficient dielectric (ie: Teflon), cryo'd for the smoothest transfer of those photons/magnetic waves and twisted in some crazy way, might not smooth out some of preturbations/noise, from the crap an AC waveform had to go through, back to it's generator.  (run-on, much?)        I haven't tested this, actually comparing two circuits, but: it wouldn't surprise me, if a power supply that used a choke, would be less affected by a better power cord, as the former can eliminate a lot of the high freq garbage, etc, that's either created by, or makes it through all the big converting/filtering stuff, before.        Never thought about PCs before the good stuff hit the market, but: the Physics/QED made sense.             I tried 'em, I like 'em and the science makes my head feel better.                               Don't care WHAT it does to anyone else's!

rodman99999 5,456 posts 03-31-2022 at 12:27am       OH, and: it takes some time for the dielectric to form, take a charge, polarize, or however one chooses to define the process, when a dielectric is subjected to electromagnetic waves, which affects the Poynting vectors, measurably/predictably.               The lower the material’s dielectric constant: the longer that takes.                                                PC burn-in?    Maybe?

                                                    Happy listening! 

                                         Make that: perturbations (oops),

                                           AS IF that'll be the objection!

It all comes to quality of electrons. With music AC signal they simply eagerly oscillate, as Rodman99999 stated. Unfortunately with a little bit of DC present, they slowly drift toward the end of the cable (drift velocity) and "poof" they are gone. Your expensive electrons just got replaced by lazy generic variety :)