Correction to my first post above: The reference to "between about 10% and 20%" should have said "between about 5% and 10%."
If you want cheap speaker cable go to Lowes or Home Depot and buy an outdoor extension cord. They come in a variety of colors including white, beige, green, blue, etc. and in 40' and 50' lengths. It is 3 wire 16 gauge. Just clip the groung wire and you are set. This cable worked best on my friend's Quads. Using bare wire connections the cost is approximately $15.00 for 50'.
Another inexpensive speaker cable is Kimber Kable Kwik 12. It competes with expensive cables at a reasonable price.