Has anyone changed any of the standard fit Megane II head unit or speakers? I'm trying to find out what the front speaker wiring polarity is. The oem speakers have a proprietary fitting and the spades are the same size so I can't work it out from that. There's nothing in the manual or on the oem speakers/wiring to indicate which is +ve or -ve. Renault won't provide me with the information unless I pay them! Anyone know?