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A friend of mine bought IEMs with a microphone (Moondrop Chuu) and it would pick up radio frequencies that you could hear through a voice call. These didn't end up fixing it, I suspected it was bad grounding but we never ended up solving what the root cause was.

With 300+ cables in my setup for audio, that's not what I want to read.

It's much less of an issue with balanced leads, so just use those?

Everything is already balanced, that's a given.

Yeah but is everything balanced or are you mixing the two? And if everything is balanced is everything properly grounded?

Incredible read on that topic: https://www.ranecommercial.com/kb_article.php?article=2127

How about shielding and grounding

A similar device does not suppress the chair/monitor effect for me. Although that monitor is particularly bad (an Asus Rog, no less!).

Oh, so that’s what those are! I’ve got a few USB-mini cables (that I think came with a PS3) that have those.