I upgraded my speakon cables with high quality speaker wire that I had lying around. You can do this if you use both red and yellow wires twisted together. Don't forget to split the positive wire across both pins at the speakon cable, this will allow you to use maximum gain. Also, depending on the gauge of wire you use, it will be necessary to do this to get it in the holes.
I did this, works a treat. I also used same cables to make the jumper leads for my line array.
Mark