The subjective evaluation of a cable and the differences between it and another cable are dependent heavily on many set of parameters :
The system gear pieces synergy ...
The system gear pieces mechanical vibrations/resonance controls...
The system gear pieces electrical noise floor controls and EMI & RFI controls...
The system/room acoustics controls parameters state..
The psycho-acoustics biases of our hearing/brain state...
Takes any publicity with a grain of salt...
But it is evident that there exist differences between cables (small one) for me and for many people..
But those who use superlatives about cables most of the times had no idea about these others parameters power i just enumerated which created huge differences each one of them compared to cables change..
I will change soon my low cost RCA cable to a priciest one (i hope a better )