If you believe that the speaker cable type makes a difference in S.Q., then to you, and you alone, it will. An exception would be that if a speaker cable is too thin, the added resistance in series with the amplifier and the speaker could affect S.Q., but for any competent cable, that is not likely to be the case. As another example, one cable consisted of two flat wide ribbons bonded to each other through thin insulation. It had several nano-farads' worth of capacitance using such conductors, and that did make some amplifiers unhappy, affecting their S.Q. and possibly their lifespan. In short, for a cable to sound bad, it really has to be hideously designed to do so.