Who has links to topics here or at all recommendations what fits in an Audi A4 B5 on loudspeakers but in the original openings and so that you can not see anything from the outside. I have one in the front doors below, and at the top of the door handles is the tweeter. On the hat rack there are also two speakers. What fits there and what is good for what? In the trunk 2x 25cm for the bass in a 100l box. To the necessity I would also plug in the doors behind, but also there only something which at the end looks as original as possible.