Why power cable effect overall syste sound?


Power cables effect the system sound. This is a well-known fact. My question is why.. specially in case of low power type "A" amplifiers where current is constant. In my single ended 300B the cable creates huge difference. Does it points on power supply PSRR issue? Actually in case of well designed power supply, the power cable should not introduce any improvement. We are spending hundreds of dollars for the 1 meter of cable from outlet to IEG socket where meters of cheap wires running in the walls and it does work. The answer on this question is puzzling me.
abronfer

Showing 2 responses by sebrof

I’ve never tried anything but stock power cords on any of my gear so not sure if they would improve things or not. But if I tried to figure it out from this thread, well…fuggettaboutit!
To me, this type of thread is exactly what cable manufacturers want. When this gets hotly debated, each side amps up even more. Instead of writing about subtle improvements you get people writing “I was shocked” and “My wife walked in the room and asked me what I did to my system” and “My non-believer buddy came over and his jaw hit the floor.” This has got to be gold to a manufacturer regardless of what the naysayers are writing.
We are talking about the AC from the wall fellas. If the cord changes that 50 or 60 cycle waveform then the manufacturers can figure out a way to show me that. I’ve read their websites, and believe me they can be very creative in their marketing. But go to the “Technical Specifications” (or similar) page of their sites and you get more marketing, no data, no proof, no before and after waveforms. Why not – It’s bad for business, that’s why. I’m not saying they can or can’t prove it, but whether or not a cord does anything and whether or not this can be proven will remain to be debated because the manufacturers have no reason to prove anything.
And btw – The reason why this thread has gotten so much attention is because the OP stated “Power cables effect the system sound. This is a well-known fact.”