Worth upgrading my cables?

First, I do not want to offend anyone, or dispute their findings about improved sound quality through better power cords.  For my system, I have normal Romex electric wire from my breaker box to my plugs.  My brain thinks that if I had a power cord made of this same Romex wire to connect from my plug to one of my components, it would not affect sound quality…it’s just a continuation of the same type of wire.  So do people that promote better power cords believe that a link of better wire somehow filters out bad characteristics, or adds in good characteristics?  I’m just trying to figure out if there’s a theory as to how this works.  On the other hand, I can see that some things can happen without explanation.

@tcotruvo The logic of the “power cords make a difference” argument is that the component to which the power cord is connected experiences the AC it receives from that cable and knows nothing of the original origin of that power. So whatever that cable does to the original AC that is what the component operates from.

An anecdote.  Paul McGowan, the head honcho of PS Audio used Audioquest’s top level power cables on his reference system gear and was confronted with the reality that his system sounded so much better than with PS Audio’s own reference grade cables. From then to this day, PS Audio recommends AQ power cords be used with PS gear. 

@hifiman5   OK, that gives me something to work off of.  I haven’t tried any power cable upgrades yet, but I’m getting there.  I suppose that most component manufacturers have to keep their costs down, so power cable upgrades are up to the consumer.  My speakers and subs are powered, so speaker wire is not a direction I can pursue.  Thanks!

@tcotruvo A bit more food for thought. Once I discovered Shunyata Research made noise reducing power cables my interest was piqued. Upon doing my due diligence, I learned that the noise reducing circuitry contained in the cable connectors reduced noise going into the component and noise coming from the component. That latter aspect really interested me. I ended up getting four of their cords, one each for my power amp, line stage, phono stage and SACD player.  Although a considerable investment, the ability to hear more fine nuances, greater detail deep in the soundstage is quite remarkable. Just when you think you understand what is possible in this hobby…

@mastering92 - My audition process is far less robust than many. When I finally pull the trigger on a product that I think may improve my system I simply hook it up and see what it sounds like. If I hear an improvement that’s awesome, but I tend to leave it in my system unless something about it doesn’t sound right, because part of my decision process for purchases is to get things that I consider to be superior so my hope is that it may have a higher ceiling with a future upgrade.  I did send a Schiit DAC back because it sounded identical to my least favorite output (it parallel solid state and tube) on my current DAC. 
 

I pretty much went Blue Jeans Cable across the board early in my audiophile journey and didn’t really dabble with cables until last year. I started with a couple of Waudio power cables for under $40 each.  The primary goal was to see if I could hear any difference in my system.  It was a clear difference for my integrated amplifier, no change on my DAC, and seemed to make my SACD player sound really bad (no idea why it had such poor results).  All of these changes were noticed immediately with the results not changing over time. 
 

The positive experience with my amplifier compelled me to dabble with interconnects. $100 AQ made a very nice improvement so I tried a $200 AQ and again notice an improvement. I was at the top of my self imposed budget so moved to digital coax cables. I picked up a $100 AQ and didn’t hear any difference so moved on to other things. 
 

I got a new DAC so wanted to shift to a balanced interconnect. I compared my $200 AQ unbalanced cable to a set of Monoprice XLR cables and really struggled to describe any significance with the AQ remaining the one I’d choose if forced. I picked up a Morrow Audio MA4 on a sale for similar money to the AQ and have found it to be a significant improvement. 
 

Most recently I tried some Micca 14 speaker cables ($60 total) and found them to be musical and easy to listen to with no brightness or glare, but found it a relief going back to my BJC cables after a couple of weeks. 
 

I find direct A/B comparisons to be confusing because I try to hard and more often than not find myself confused. I’ve had the same experience with some other changes where what you remember from A doesn’t meet reality when you do switch back.  Sometimes the improvement is so obvious that I don’t even waste the effort going back and with the speaker cables it was a relief to go back.