I had some trouble keeping the 12 gauge bare wire connected to my old QS8s. The wire was stiff and there weren't alot of strands to it. Over time the connection would get loose. They were on stands that I moved around a bit, too. My new QS8s came with the same "wrench-able" binding posts as the M60s, so I really cranked the nots down on the wire. So far so good. It seems to me that these fatter wires don't like to stay plugged in as well. Maybe connectors would be in order?