Hi I've just installed and aftermarket stereo in my Audi A3 None Bose. I got the right cables and the rear speakers and everything works fine and it sounds like the sub is on someone correct me if Im wrong as I didnt have to join anywires I just used the cables I bought. My problem is that when I turn CD player Off my rear speakers stay on and make a buzzing sound. Also my head unit has constant power to it. Please help the speaker buzzing is Annoying. Also like I said if there is something I have to do to make the sub turn on and Im just imagining its on then please let me know.