Home Depot and Lowe's carry low voltage lighting cable that is every bit as good electrically (The ONLY thing that matters) as the highest priced, hyperbole enhanced, sucker targeted, yogurt immersed, magnetically encompassed, longitudinally massaged, speaker cable available.
Stp for a moment and think about the guts of the system. Everything INSIDE the source system and AVR are off the shelf components and hook up wire using mass produced flow soldered PCBs. Why on earth and exactly HOW can a piece of wire of sufficient awg to handle the max current usable by the speakers do anything more than the amp itself?
This has been covered ad nauseum and not one single person nationwide has EVER actually successfully proven the high dollar cable claims because it cannot be done.
Salesmen do NOT change the laws of physics.