Audi A4 Cabriolet 2004 - 7 - Rear Midrange Speakers; 8 - Rear Bass Speakers; 9 - Bass Loudspeaker; 10 - Center Mid;High Range Loudspeaker

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7 - Rear Midrange Speakers
In upper rear door trim
8 - Rear Bass Speakers
In lower rear door trim
9 - Bass Loudspeaker
Under rear parcel shelf
10 - Center Mid/High Range Loudspeaker
In instrument panel
11 - CD Changer Unit
In glove compartment
12 - Satellite Radio
In left rear luggage compartment
13 - Satellite Tuner Antenna
On roof
Also for Telematics and Navigation
Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication