Kind of a dumb question but I couldn't find much on it and was wondering what kind of problems could be caused by doing it wrong. I know there is obviously positive - negative hookups on avrs and speakers. But I have speaker wire that isn't labeled or color differentiated in any way. Both wires are exactly the same. I thought about completely getting new wire but that really isn't realistic because it is all prerun in walls and ceilings. When hooking up I really have no way of knowing which is which. The sound seems to work with both wires if I switch them which seems odd to me but was wondering if there is any secret to be able to tell which is which? Will hooking up wrong cause damage at all? Fill me in on this if you can!