I just got a brand new AV receiver and speakers today. One of the many included documents makes note of how and how not to wire the speakers. One note in particular says "Do not connect two speaker cords to lengthen it." Why is this? I have a ~15ft wire run that came up about 2ft short and I need to lengthen it with another wire roll I have. I was going to just connect them and wrap them in electrical tape, so can someone tell me why [Sony] says not to? Thanks.