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. 
128x128mkgus

Showing 5 responses by phomchick

I thought this was an audiophile site?!? It reads more like a “audio on the cheap“ site...  
Unfortunately, in today’s high end audio market, there are entirely too many opportunities to spend vast amounts of money for no effect whatsoever. When I started with the hobby fifty years ago, it was a tech hobby, where you learned the basic laws of electronics and acoustics and expected the manufacturers to use those laws in their products. Today, you can spend a thousand dollars on a power cord without the manufacturer providing any grounded theory as to why it is superior to a standard 12ga 15 amp IEC cord. You are just told it sounds better, or fed some marketing mumbo jumbo. Well of course it sounds better; if you parted with $1K for the cord, obviously your system will be improved. It’s called confirmation bias. This kind of stuff has been around for a long time. A hundred years ago, it was called Patent Medicine. 


Just an observation. Interesting conversation. I started reading it from the beginning but then the same ole pattern was obvious. There are those who have spent the money, did some serious listening, and have drawn some conclusions on if this or that makes a difference in SQ in ones system. Usually these are people who can point to something specific when making such a claim, or explain their observation e.g. better highs, or better bass, or better imaging, etc.. On the other hand there are those who criticize, but only have that criticism with no meat

Those that claim they can hear a difference in power cables provide no more meat than the skeptics. If there is a difference in sound, there must be a difference in the signal going to the speakers. I have never seen any proof of this. 

Actually, if one had a spectrum analyzer then one could see the improvement since it is easy to measure the power output with and without the new cord for a given piece of music.   Once you have it hooked up, there is a LOT you can measure. Granted, not every audiophile has an expensive chuck of test equipment lying around
But cable manufacturers could afford this equipment, and they could use the results (perhaps a reduction in the noise floor) in their marketing materials. But they don't. Why do you suppose that is the case?


Like I said, I'm not saying one way or the other whether you can hear a difference or not. Just curious to see if there are any measurable differences, even very subtle ones. Anyone else?
Excellent question.