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I used to live on the Avenida Paulista in São Paulo, Brazil and one of the interesting quirks about that location is the number of high power TV and Radio antennas in the immediate vicinity. At the time I had a hi-fi system that had previously sounded great, but in this particular location was impacted by the high electromagnetic interference in the area. Most of the noise got in between the RCA cables between the pre-amp and the power amps.

I spent the better part of a year building cables and trying out different designs to isolate the noise, such as having a floating woven metal shield with a small capacitor at one end to ground the shield. I don't remember all the different things I tried, but they definitely had varying levels of material impact. That said, with RCA cables I never got the noise completely out of the system and eventually switched everything out for something with balanced XLR connectors, which eliminated the problem.

tl:dr; expensive cables don't really matter. cable design does to a point, but if you really want great sound without interference, you need to switch to a system with a balanced design. Unfortunately, this requires changing all components, not just the cables.


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