Audio cables ,and power cords the most forgotton- part of an Audio system.

I have been in Audio for over 35 years and owned and operated a  Audio store as well as buy just from the A list ,which does not guarantee system synergy.
I have tried   inexpensive cables like blue jeans  that is fine for a entry level system. 
If you have electronics $5k and up and 5 figure Loudspeakers then to get ultimate resolution 
You have to spend some money's on last cables 2pr interconnects  and a pr of 6ft Speaker cables 
I had, Silnotes, Analysis plus  even more expensive Synergistic research.  Decent but not the realism I was after.
To get to that last5-  10% + in fine detail and resolution you have to spend. I was stubborn but really 25% for example.Of your total cost is not that much. When you see just how much refinement and fidelity 
You may be missing .My brother brought over his Verastarr power cord over to try on my digital 
Which is most sensitive,  I had a $600 Kimber power cord, his grand illusion cord made the music so much more real,there are other very good cables but these are one of the best I have ever heard without breaking the bank. . Is that worth over $1k ?  I did the same with interconnects and speaker cables 
I spent $6k  and still have s few power cords to go. One thing my system as a whole is a minimum of 10% better. And  a you are there on any decent recording.   Fine tuning with Duelund capacitors
Bypass and coupling caps are next and final step in tweaking the system and a bit over priced. and these may be equal to or better  in added tonal balance and depth. 
This just proves having the best speakers or electronics is only half the battle.
You are only as strong as your weakest link .
i replaced $5000 worth of cables with $500 worth of cables and the sound got much better. More resolution, more dynamics and deeper bass. The cables were 1950's Western Electric and current WE copies made by Dueland. Best cables I have ever owned and cheapest
@audioman58  Do you have measurements to back up your claims?  The skeptics/science addicts will demand objective data.  Otherwise you are delusional or suffering from some other psychological malady.
I heard it from Peter
Who heard it from Paul
Who heard it from someone
I don't know at all
I heard it from Mary
Who heard it from Ruth
Who swore on the Bible
She's telling the truth
I heard it from Simon
Who heard it from James
Confirming with Sarah
That I was to blame
I heard it from Joseph
Who heard it from John
Who said with conviction
That all hope was gone
So I need to know
Your alibis ...

...From Depeche Mode's Exciter album track 10 "Breathe"
get it?
I havd had the Duelund cables pretty decent but not in the same league .I have done direct testing several others arrested to .The best measuring tool is your ears .I have had many variations .
If you choose to not try other cables for whatever read on 
That's on you . Many times people knock what they don't understand or out of added expense. .I have forgotten more then most if you will ever knowmsnd uour snide immature remarks.That is all I will say on this matter !!
I just started replacing stock power cords this week so I’m glad this topic showed up.   I’ve heard nice improvements with interconnects in the past, not so much with speaker cable, and I always stayed away from power cords thinking it was total  snake oil.   Then I read some audio forum posts saying power cords were the most important of all the cords you could replace and it turned out to be true.   I’m trying the Wireworld AC cords.  For the cost of one large component upgrade, I was able to take all of my components to a higher level.   Really pleased with the results and surprised I went so long without trying it.