Hi Guys, First post here, great website! Just a quick question, does anyone know what the voltage should be for the remote on wire from the head unit to the amp? I'm reading 7.8v and 12.5v on the main power cable (engine off). I have a 54, A3, 3 door, non bose, concert II. The rear speakers and amp have stopped working and Audi said that the amp had blown. I just wanted to check this myself as I don't trust the dealer. Thanks.