In term of construction, what's the difference between cheap vs. expensive power cables


When it comes to interconnects and speaker cables, it is easier to understand the justification for the costs of these cables.  But when it comes to power cables, it is a little difficult to understand.

Some believe that as long as the power cable has enough gauge the that's all you need.  I've used some cheap power cables vs. some high price cables and there are clearly differences in sound, so the "gauge" of the cables is not the ONLY thing and it's a little bit more complicated than that.  

In speaker cables design, you can adjust the R/L/C parameters to achieve a certain kind of sound and it's easy to visual how these parameters will affect the sound.  For example too much C then the sound will lack leading edge.  Too much L then the sound will be brittle.  If too much R then the sound will lack dynamic.  Or if the cable has too much jitter, then the transparency will be affected.

But the power cable main job is to establish a DC source, it's not too clear how the R/L/C parameters will affect the sound the same way these parameters will affect the sound of the speaker cable.  Also I am not sure how jitter would affect a power cable either

So the bottom line is what's actually inside a power cable that make them so expensive?  Do they use fancy dielectric?  How about construction geometry?  

For a designer, I mean how do you fine-tune your power cable.  How do you know your power cable will sound good?
andy2
It is a very complex question. I think that every manufacturer has their secret sauce. But I can tell you that a lot of parameters influence the power cable. Dielectric, most of good cables are in air. Geometry is very important as well. And there are a lot of other small details that matter more or less depending on the design. I have two completely different designs at moneoone and at the end only the ears can be the judge.
You always only get what you pay for, everything in this hobby is always built to its price-point. 

If its just a “race-to-the bottom” and “low-as-you-can-find-it” price-point exercise here, it gets simply AND quickly distilled down To just a “pick one of ‘em exercise”. 
Requisite Audio makes cables for the recording industry but will sell to home audio enthusiasts. They have very reasonable prices for their cables that would surprise most here but their power cables start at around $600 or so because that's the cheapest they can make them and still have them perform at the level they require. 
http://requisiteaudio.com/
Just making something that can pass local code and won't burn the house down doesn't mean it will sound good in one's system.

All the best,
Nonoise
https://forum.audiogon.com/discussions/extra-extra-millercarbon-proven-wrong-read-all-about-it-extra...

Please read the last post. You can wrack your brain trying to understand why. Or you can accept what is, and move forward. Denial, or acceptance. The choice is yours.
The sound of any electronic component starts with its power supply. NOT with what comes before it! A power cord is NOT part of the power supply! Contrary to what the deluded believe!