I have been a stickler about keeping power cables away from signal cables...on equipment ?

All my components have, and as far as I know have had, the power coming in on one side and as far from inputs as possible. Especially critical in sensitive components like phono stages. Now this may well be due to the way all my components are selected on the basis of sound quality performance, and sound quality performance alone. I do not care for specs nor do I decide based on technical stuff like what parts are used or how they are laid out. Because while all these things are important, no one knows enough to know which is most important, or how doing one thing one way matters more than another way.  

All I know for sure is all the best stuff (as arbitrarily decided by me anyway) is built the way you describe. This is also a big factor in why receivers are the crappiest worst sounding components in all of audio- too much stuff crammed too close together. Never a good idea.

My system looks a mess but is laid out with a lot of spacing between cables, including keeping them all up off the floor. https://systems.audiogon.com/systems/8367 And yes these details do make a difference you can hear. 

When you have a neutral and live wire running side by side, the electrical fields are opposing and cancel out if the noise is what is called "differential", i.e. what we think of as current powering our equipment. Those fields because the wires are close dissipate really quickly.

There are other currents, common mode, which travel the same direction on both cables. That gets in via ground connections, through RFI etc.  That does not cancel out and can hence create a field that has a impact at larger distances. 


Good equipment will include circuitry to filter out both types of noise. It also depends on the signal levels close by. All digital circuitry will be more immune than line level signal, which will be more immune than a phono input.

I have my power cable, AES3 cable and ethernet cable all running parallel and strapped together from my speakers to where they separate and go to their particular device, streamer, switch and surge protector/ power conditioner. I kept them apart for awhile going back and forth never noticed a difference so I keep them neatly tucked together now.

Just for kicks, I looked at the backs of my components to see how far away the mains plugs are from the interconnect terminals.  All three -- my Mytek Brooklyn BB, my Primaluna Integrated and my Sony CD/SACD player -- have the power connection on the far left, with the component connections as far to the right as reasonably possible.  All this leads me to believe that keeping the mains supply as far as possible from the other connections is accepted practice.

I also believe, power switches and it's wiring, should be designed at the rear of a component, for the reduction of ac related noise, even though it might be an inconvenience with it's daily operation.

My Herron VTPH2A power switch is on the back right corner, right next to the iec. It is a bit of a hassle. But for all the right reasons.