No it doesn’t take $15k to fix digital. I have $600 ones that do a great job of that (although they are different in that they have passive digital filtering built in them), but, in the nose-bleed territory, as I understand it, it can come down to a cord design that can filter upstream, down and then also filter out its own noise...that, from what I can gather, is something of a holy grail of cord design...and no, it’s evidently not the same thing as ’coming up with a good braid’. Few designs actually ’filter themselves out’ of the equation. Don’t know anything about the one inna mentions, though.