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

Hello,
I think it boils down to your cables and the resolution of the system. When I started getting into better components and cables I figured out the difference in recordings. 1/2 of my CD collection was from BMG. Horrible sounds came through my new system. Luckily I was able to trade all of my BMG for the regular/ better recordings since a friend owned a used cd store. I can’t even fathom listening to some of your systems in your properly treated rooms. It’s a double edge sword that’s worth it if you can afford it. If I can make it to Seattle someday I can finally listen to Michael’s record collection. He might make me clean some of his records for the right to do so. JK. Bottom line, If you raise or separate your cables like in MC’s picks and you hear the difference, do it. If it doesn’t move on to the next suggestion. 

Optimize, Demo the Puritan power conditioner. It might help. Demo it first because they are not cheep but the do work without choking the sound. 

@hshifi thanks for the tip.
Need to see what i could do abut it I am little bit of a DIY:er. But there is some other projects in the pipe.

Optimize,
a bipolar +- 15v battery supply is a relatively simple affair. It might get sticky adapting it to your circuit.

Cheers, Crazy Bill

Perhaps I missed it, but I don't see anyone considering that vibration in the cables/cords are as big or bigger a factor in degraded sound performance as electrical interference.  I keep my power cables as far as reasonably possible from my ICs and speaker cables because I can. My experience over the years is that it does make an audible difference with certain brands and models of cables.  I don't find it makes much difference with my current cables, but that's part of the reason I chose them.  Isolation from vibration is a different story.  The power cords seem least affected, the speaker cables definitely benefit from vibration isolation, and the ICs are the most sensitive.  When something sounds "off" nowadays, I invariably find one of my cable separators has gotten knocked loose allowing an IC to contact a wall or some other source of vibration.  It's an easy and immediate fix.  I'm meticulous about keeping isolation factors from affecting my components and it pays off.  It's much simpler and far less expensive to keep the cables from picking up vibration via careful routing and relatively inexpensive cable isolators/separators.