I can't agree anymore. I'm SOOOOOOOOOOOO sick and tired of the whole "cables DON'T make a shred of difference" posts on numerous forums. I've been using HQ Audio Magic XStream XLR cables (back from 1999-2006) and then got into "pure" silver or silver plated copper XLR cables, all while using the exact same pair of AKG 480 microphones to record live music (everything in the jamband scene including Phish mainly) and I can without a doubt here that switch in XLR cables, and for the worst. I much preferred the AM XStream copper cables for those mics as the silver/SPC were very shrill and shouty sounding compared to them.
But now, and since 2011, I've been running Schoeps microphones with the Schoeps KCY cabling, so I can't comment on that anymore.
Onto IEM Cables now....
BUT, in the last 10 years I've had NUMEROUS expensive IEM's (Campfire Audio Andromedas and Dorado's, about 4x different pairs of the V1 and V2 Westone UM Pro 30 IEM's, to some Chi-Fi IEM's and VARIOUS (like 20+ different IEM Cables, ranging from cheap ofc, to high end OCC copper and SPC (silver plated copper) copper IEM Cables, ranging from $10 to around $300.
Bottom line is, i have phenomenal hearing, even after the 1,000+ shows/concerts I've recorded since 1997. And just because I CAN CLEARLY hear a difference between one cable vs another, and can't "prove" it, is just rubbish!!!! To say because one person can (me) and one person can't (you) hear an easy different between IEM Cables and since it's subjective and not "provable", that I'm wrong, is just idiotic IMO.
I wish EVERYONE had the amazing ability to hear subtle changes in sound as i do do, but lets face it, they don't.
I can hear the BIGGEST difference in IEM cables when going from a pure OCC copper cable to a SPC OCC copper cable. Or a pure 6N (the purest) occ silver cable, much easier than the purity of them 4N/5N/6N/7N for copper or 4N/5N/6N for OCC silver. Also, the diameter of the conductors and etc.
But i can absolutely without a doubt tell the difference between an OCC copper/SPC OCC copper/OCC silver cable, and I have enough confidence that I could do it blindfolded.
I cannot speak for speakers and amps and cables, as that's not my foray and expertise. But i can clearly hear the difference between my old Audio Magic XStream XLR cables and the custom silver/SPC in regards to my old AKG 480 microphones when recording live music.
But the easiest for me to tell the difference is obviously IEM Cables. Switching conductors like i said (OCC copper, SPC OCC copper, OCC silver) and not so much the purity, is something i do EVERY single day.
So my word of advice is, just because YOU cannot hear any difference in cable varieties and I CAN'T prove it, since it's mostly subjective. DOESN'T mean that someone with better and more critical hearing of details CANNOT