Why Power Cables Affect Sound


I just bought a new CD player and was underwhelmed with it compared to my cheaper, lower quality CD player. That’s when it hit me that my cheaper CD player is using an upgraded power cable. When I put an upgraded power cable on my new CD player, the sound was instantly transformed: the treble was tamed, the music was more dynamic and lifelike, and overall more musical. 

This got me thinking as to how in the world a power cable can affect sound. I want to hear all of your ideas. Here’s one of my ideas:

I have heard from many sources that a good power cable is made of multiple gauge conductors from large gauge to small gauge. The electrons in a power cable are like a train with each electron acting as a train car. When a treble note is played, for example, the small gauge wires can react quickly because that “train” has much less mass than a large gauge conductor. If you only had one large gauge conductor, you would need to accelerate a very large train for a small, quick treble note, and this leads to poor dynamics. A similar analogy might be water in a pipe. A small pipe can react much quicker to higher frequencies than a large pipe due to the decreased mass/momentum of the water in the pipe. 

That’s one of my ideas. Now I want to hear your thoughts and have a general discussion of why power cables matter. 

If you don’t think power cables matter at all, please refrain from derailing the conversation with antagonism. There a time and place for that but not in this thread please. 
mkgus
Roger of Ramtubes has the opposite view of Atmasphere and myself.  He says that any PC cable that sells for over $100 is a waste of money.  He thinks that there are advantages to better quality PCs but not after $100 price.  I've tried maybe 20 PCs in my time, including lower and middle end Audioquest, Magnan cable (horrible High Fidelity cable), etc. and found GroverHuffman cable to outperform them at $400 to $900 (depending on model).  Very much higher than $100.  Infinitely more complex in design than a $100 cable as well.
1) Only poorly designed gear benefits from upgraded power supply cables or power source (power conditioner, etc.). If your product benefits from it, return it and get a better made one.
 
2) Unless you are doing a long run, EMI is not an issue unless you literally have a radio tower next to you. Even then, a well shielded cable or a ferrite chocker can be very cheap, no need to buy >$100 cables. 
 
3) Mains noise is also usually isn’t that bad, so fixing it likely wouldn’t provide much of an audible difference outside of subjective opinions.
Only poorly designed gear benefits from upgraded power supply cables or power source (power conditioner, etc.).

No doubt a well-built, oversized power supply goes a long way towards reaching maximize sound quality. 

If your product benefits from it, return it and get a better made one.

Manufacturers have to build to certain price points based on consumer wants and needs, and unfortunately (most) people have budgets they have to stick to with this hobby. Most anything “budget friendly” will benefit from power cables because they will have a power supply that’s “good enough” to get good sound, and not over-engineered ones that are required for high end audio. You could say these budget friendly models are poorly designed but many are probably good designs given their price point.
@mkgus

Manufacturers have to build to certain price points

Maybe if we are talking $100 power amps or $30 DACs. Any issue with power supply would show up in measurements done by various sites (again, unless you live literally next to a radio tower, as the reviewers likely don’t), and it’s very rare for any products, regardless of price, to show any mains leakage (harmonic distortion every 60Hz, or 50Hz for Europe and whatnot).

Disregarding mains leakage and focusing on EMI, a 20¢ ferrite with most likely solve the issue.
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