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
Research, design, quality and quantity of conductor, screening, quality of dielectric and sheath, quality of plugs. Any other treatments and processes during manufacture plus testing and listening evaluation would add to the price. And these are not all.
To me it blatantly obvious why good power cords improve sound.

The power supply has the job of converting the AC mains source into a ripple free DC source for the B+ rail. The more noise the PC can remove from the mains before it reached the power supply, the lower the noise on the B+ rail will be. The higher noise on the line that enters the power supply, the higher noise will end up on your B+ rail. 

Individuals who claim power cords cannot help obviously have no understanding of the challenges to turn AC into clean, ripple free DC and the lengths some designers go to to address the issue. 
@nonoise 
harry is obviously the local troll that has been banned multiple times.

Clearly some gadfly's cannot take the hint ... 
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