If you can’t hear any difference in sound from a high quality cable freshly installed in a good system, to the same cable and system after a couple of hundred hours, it just means your ears aren’t as sensitive as someone who can. Different people need different glasses prescriptions to see the same things as clearly as each other. Opticians have sophisticated measuring devices to get you the right prescription. We don’t have the equivalent for hearing, well, not unless you need hearing aids.
