Hi I have fitted a aftermarket hu and the rear speakers are quite as a mouse! Have the correct cables all in half amplified . So the option now is to either rewire the speakers direct or replace the amp and run the speakers from that. So where in the boot do I find the amp on a 55plated a4 1.8t cabriolet . Any help would be appreciated ! A photo would be good as I can't fun one anywhere! Thanks mj.