Navigation Plus Rns4 Cd Changer

[maxbulldog]

Hi
I have a 2002 A4 Avant TDI 130 with the navigation plus fitted, i just got the car and have realised that it doesnt have a CD player fitted, i have looked in the boot (left handside) there is a black plastic box with a small silver box in it with aerial wires going to it but no cd changer or cable, to the right of the boot it has another box which says Audi amp on it with a speaker below?? is this where it should be? I read that you can get glove box changers and i have also looked behind the glove box but cant see any CD cable there i cant believe that Audi have built a car that has only radio and no CD can this be right? I guess i must get on ebay and buy a changer does aqnybody know which one i need?

Thanks for all your help to a newbie