Most speaker installation jobs require wires with only two conductors - four is often overkill and unnecessary. The only major advantage is gaining the ability to twine your 4-wire cords to create two pairs of lower gauge wires. For standard home stereo installation purposes, 2-wire speaker cables will suffice. Select the speaker cable wires you need and choose between 50ft, 100 feet, 250foot and 500 foot lengths. For in-wall or outdoor use, make sure to choose 2-wire cables that are CL2 rated.