A4 Mk2
| BOSE (Saloon) |
| 1 - | Rear window aerials for AM/FM/TV |
| 2 - | Aerial selection control unit -J515- behind roof end trim |
| 3 - | Navigation aerial -R50- behind roof end trim |
| 4 - | CD changer -R41-/iPod holder -R192- in glove box |
| 5 - | Mid-range/treble loudspeaker, front left -R26-/mid-range/treble loudspeaker, front right -R27- in front doors (top) |
| 6 - | Bass loudspeaker, front left -R21- and bass loudspeaker, front right -R23- in front doors (bottom) |
| 7 - | Internal loudspeaker -R70- in dash panel (front centre) |
| 8 - | Mid-range/treble loudspeaker, rear left -R34-/mid-range/treble loudspeaker, rear right -R35- in rear doors (top) |
| 9 - | Bass loudspeaker, rear left -R15-/bass loudspeaker, rear right -R17- in rear doors (bottom) |
| 10 - | Bass loudspeaker -R100- in rear shelf |
| 11 - | Amplifier -R12- behind luggage compartment side trim (right-side) |
| 12 - | Internal microphone -R74- in front interior light -W1- |
| 13 - | Navigation system with CD drive control unit -J401- in centre console (top) |
| 14 - | Telephone microphone -R38- in front interior light -W1- (from model year 06 on RNS-E high) |
| 15 - | Telephone transmitter and receiver unit -R36- in electronics box beneath front seat (right-side) |
| 16 - | CAN bus (infotainment) |
| 17 - | Navigation/TV tuner -J415- behind luggage compartment side trim (left-side) |
