This video goes into detail about why using shielded RGB cables make a difference.
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Here's raw captures: https://drive.google.com/file/d/0Bx8t...
Here's the original "Pt1" Overview Video:    • $6 RGB SCART Cable vs High-quality sh...  
Cables for each console can be found here: http://www.retrorgb.com/systems.html
A video on how to check the components in your RGB SCART cables can be found here:    • How To Test Components in an RGB SCAR...  

In the video, I reference a "noise floor". Basically, that means all analog cables will have SOME kind of noise or interference going through it, but it's only noticeable if you crank the volume on silent parts: https://en.wikipedia.org/wiki/Noise_f...