Cable management....crossing at right angles or

Good morning,

I have been out of the hobby for a while, and now just getting things back into my system.

No matter how I try, I can't keep my cables isolated from each other, especially speaker and power. Is there anything besides the old saying of trying to cross at right angles, something..copper tape/Faraday sheets that you can put on the cables when they cross to reduce-eliminate interference or distortion/ EMI RFI?

Thanks,

Randy