Audi A4: Overview - Sound System

The following systems are offered:

• 8RM - Basic sound system.
• 9VD - Standard sound system.
• 9VS - Premium sound system, Bang & Olufsen.

8RM - Basic Sound System

• One speaker in the left and right front doors
• One speaker on the left and right side of the instrument panel
• Two speakers in the left and right rear doors

1 - Information Electronics Control Module 1 -J794- in the Glove Compartment

2 - Left Front Treble Speaker -R20-/Right Front Treble Speaker -R22- in Left and Right of the Instrument Panel

3 - Left Front Bass Speaker -R21-/Right Front Bass Speaker -R23- in the Lower Front Doors

4 - Left Rear Treble Speaker -R14-/Right Rear Treble Speaker -R16- at the Top in Rear Doors

5 - Left Rear Bass Speaker -R15-/Right Rear Bass Speaker -R17- at Bottom in the Rear Doors

6 - MOST Bus

9VD - Standard Sound System

• One speaker in the left and right front doors
• One speaker on the left and right side of the instrument panel
• One speaker in the instrument panel center
• Two speakers in the left and right rear doors
• Subwoofer -R211-

1 - Information Electronics Control Module 1 -J794- in the Glove Compartment

2 - Left Front Treble Speaker -R20-/Right Front Treble Speaker -R22- in Left and Right of the Instrument Panel

3 - Left Front Bass Speaker -R21-/Right Front Bass Speaker -R23- in the Lower Front Doors

4 - Left Rear Treble Speaker -R14-/Right Rear Treble Speaker -R16- at the Top in Rear Doors

5 - Left Rear Bass Speaker -R15-/Right Rear Bass Speaker -R17- at Bottom in the Rear Doors

6 - Center Speaker -R208- in the Instrument Panel Center

7 - Subwoofer -R11- in the Rear Shelf/Luggage Compartment

8 - MOST Bus

9VS - Premium Sound System, Bang & Olufsen

• Two speakers in the left and right A-pillars
• Two speakers in the left and right front doors
• One speaker on the left and right side of the instrument panel
• Two speakers in the center of the instrument panel
• Two speakers in the left and right rear doors
• Two speakers in the rear shelf/left and right D-pillar
• Subwoofer -R211-
• Digital Sound System Control Module -J525- in the luggage compartment on the left rear side

1 - Left Front Treble Speaker 2 -R220- in the Upper A-Pillar

2 - Left Front Midrange Speaker 2 -R276- in the Instrument Panel on the Left Side

3 - Left Front Bass Speaker -R21- in the Bottom of the Front Door

4 - Left Front Midrange Speaker -R103- in the Bottom Center of the Door

5 - Left Front Treble Speaker -R20- in the Upper A-Pillar

6 - Left Rear Treble Speaker -R14- in the Rear Door at Top

7 - Left Rear Bass Speaker -R15- in Bottom of the Rear Door

8 - Left Effects Speaker -R209- in the Rear Shelf/Left D-Pillar

9 - Center Speaker -R208- in the Instrument Panel Center

10 - Center Speaker 2 -R219- in the Center of the Instrument Panel

11 - Antenna -R11- in the Rear Shelf/Luggage Compartment

12 - Right Effects Speaker -R210- in the Rear Shelf/Right D-Pillar

13 - Right Rear Bass Speaker -R17- in the Bottom of the Rear Door

14 - Right Rear Treble Speaker -R16- in the Rear Door at Top

15 - Right Front Treble Speaker -R22- in the Upper A-Pillar

16 - Right Front Midrange Speaker -R104- in Center of the Front Door

17 - Right Front Bass Speaker -R23- in the Bottom of the Front Door

18 - Right Front Midrange Speaker 2 -R277- in the Right Instrument Panel

19 - Right Front Treble Speaker 2 -R221- in Upper A-Pillar

20 - Interior Microphone -R74-, Microphone Unit in Front Roof Module -R164- in the Front Interior Lamp -W1-

21 - Digital Sound System Control Module -J525- in Luggage Compartment on Left Rear Side

22 - MOST Bus

Notes on MOST Bus

The optical data bus "MOST Bus" is used in addition to the CAN Bus.

A fiber-optic cable is used. Fiber optic cables are routed inside corrugated tubes for protection.

Replace the complete fiber-optic cable if possible.

The front surface of the connectors must not be contaminated.

If disconnecting the connectors: Attach the Fiber-Optic Repair Set - Connector Protective Caps -VAS6223/9-.

When routing fiber-optic cables, make sure not to go below the minimum bending radius of 25 mm. Do not crush or kink fiber optic cables.

Repairing fiber-optic cables. Refer to → Chapter "General Repair Information".

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