Mcmiller, this explanation of the advantage of star quad geometry is from the Canare website:
Here is a link to the Canare webpage from which I copied this statement. It also includes two diagrams.
Speaker cable must accommodate relatively high signal levels, typically tens to hundreds of watts of RMS power. Electromagnetic interference (EMI) can radiate from these speaker lines directly into adjacent low voltage cables (i.e. microphone, video lines, etc.). Canare solves this problem by using a 4-conductor Star Quad configuration in all of our 4S Series speaker cables. Because every conductor is located the same distance from the center, the opposing magnetic fields are cancelled out. Attenuation of magnetic field radiation is superior when compared to a standard 2-conductor speaker wire.
Here is a link to the Canare webpage from which I copied this statement. It also includes two diagrams.