I would like to make a correction to my recent posting. I meant to say speaker cable should be kept to a minimum length because that is what transfers the power.
OCOS made claims that their wire is ok for long lengths and they even said you can use different lengths. I have a friend using OCOS and we compared both ways. The result was the OCOS sounds better in short equal lengths. OCOS is a very unusual product since it is coax cable rather than speaker cable.