Audi A4 Cabriolet 2004 - 6 - Rear Bass Speakers; 7 - Rear Midrange Speakers; 8 - Bass Loudspeaker; 9 - Center Mid;High Range Loudspeaker

91-29
6 - Rear Bass Speakers
In lower rear door trim
7 - Rear Midrange Speakers
In upper rear door trim
8 - Bass Loudspeaker
Below rear shelf
9 - Center Mid/High Range Loudspeaker
In instrument panel
10 - CD Changer Unit -R41-
Optional
In glove compartment
Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication