@ieales ^^^
The above is utterly pointless. Any deltas are specific to that system and room and unlikely to translate to an entirely different system.
There are plenty of expensive cables that are demonstrably designed to be ’tone controls’ and are by no means an improvement on any but a small subset of equipment.
Have you ever tried it? What were there results? "Unlikely" how, share more?
The same tests can be repeated at home too with similar results. Tests like these are pointless to those who’ve never tried it, or shared results in a group of peers.
Having worked for a speaker company, where blind listening tests were executed with groups of 30-50 university students in different room settings; The speakers were designed and developed with access to an isoberic chamber. Cables were swapped too. One could argue none of this translates either once the speakers are brought home for use. None of it was pointless. A lot can be learned in tests. Sure, one can argue all cables are passive tone controls, and poor designs impacting sound more than others.