Ok guys I have searched the forum but cant find a definate (fool proof) answer to getting the rear speakers and sub working. I have an 01 A3 which had the Concert stereo and CD changer. I have plugged the Becker straight in and it seems to be working great apart from the rear speakers and sub... no sound at all. I know I have to give the rear amp power to work speakers but how do I do this? Which wire from audi loom do I plug into the Becker. Please help as its really pi**ing me off now. Many Thanks. Graham.