In my experience, higher gauge power cables make a difference. Even cheap ones. As it was partially explained in a video posted a few weeks ago- A thicker cable has more copper crystals per linear measure, and therefore more barrier options. So as the electrons wobble in their crystals, there are more boundaries they can bump into- (more options available) to transfer current. It is a faster transfer. Plus, a larger outer surface as well. This is why a thicker cable has more capacity for instantaneous dynamic loads. Which is why you notice improved bass response, bass drivers of course require the most instantaneous power- and improved power availability equals audibly improved performance. Run 10 gauge wiring on your dedicated 20a circuits in your wall. And 10ga cables to your equipment.