Troy I cant give you a technical response , I will leave that to JohnK . I will say that electricity takes the path of least resistance, so more wire surface for the electricity to travel the least resistance. In this case ,unless these speaker wires are stupid long there will NOT be any benefit to doubling the wires. At most he will gain redundancy so if one wire fails the other will back it up. Google home made speaker wires in images you will see people braid together cat5 cable to make fancy speaker wires.
Richard
