I built some of those after reading about them. They definitely changed the sound of my speakers...for the worse.

I now use Canare 4S11 with both pairs connected to the binding posts at each end for the main channels, and Belden 12 gauge everywhere else.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris