Audi A4 B9 – Subwoofer Menu

Audi A4 B9 Facelift Subwoofer Menu Activation (RetroLab Pro)

Audi A4 B9 Facelift models with Audi Sound System (PR-9VD) are limited to basic Bass and Treble controls from factory. While the subwoofer is active, its level cannot be adjusted independently in the MMI.

This activation enables the hidden subwoofer menu, allowing separate adjustment of Bass and Subwoofer levels for a more controlled and tailored sound experience.

Using RetroLab Pro, the function is activated through a guided, VIN-specific OEM process — no dealer visit, no remote coding session, and no manual scripts required.

Key Features

• 100% OEM integration
• Unlocks subwoofer adjustment in MMI
• Independent control of Bass and Subwoofer
• Improved sound precision and balance
• Activated via RetroLab Pro (PC application)
• Guided VIN-based OEM activation

Compatible Vehicles

• Audi A4 B9 Facelift (2020–2023)
• Vehicles with Audi Sound System (PR-9VD)
• MIB3 MMI system

Compatibility Notes

• Requires Audi Sound System PR-9VD
• Applies only to vehicles with factory-installed subwoofer
• Works on vehicles from EU / NAR
• Not supported: Bang & Olufsen sound system
• Not supported: model year 2024+

How It Works

After purchase, the activation is assigned to your vehicle’s VIN. Using a Windows PC and an ENet cable, you connect to the vehicle and perform the activation via RetroLab Pro. The required configuration is applied automatically.

Requirements

• Windows PC with internet access
• LAN (Ethernet) port
• ENet cable (OBD to Ethernet)

What’s Included

• VIN-based OEM activation entitlement for subwoofer menu
• Activation of subwoofer control in MMI
• Support if required

Also Available For Other Audi Models

This subwoofer menu activation is also available for other compatible Audi models:

• Audi A5 F5 – Subwoofer Menu Activation
• Audi A6 C8 – Subwoofer Menu Activation
• Audi A7 C8 – Subwoofer Menu Activation
• Audi Q5 F5 – Subwoofer Menu Activation
• Audi Q7 4M – Subwoofer Menu Activation
• Audi Q8 4M – Subwoofer Menu Activation
• Audi e-tron GE – Subwoofer Menu Activation

Below are some common questions about subwoofer menu activation.

Frequently Asked Questions

Do I need to install additional hardware?
No. This activation works on vehicles already equipped with Audi Sound System (PR-9VD).

What does this activation change?
It adds a dedicated subwoofer control in the MMI, separate from the main bass adjustment.

Is the improvement noticeable?
Yes. You gain better control over low frequencies, allowing a more balanced and refined sound setup.

Is any remote session required?
No. Everything is performed locally using RetroLab Pro.

Important Ordering Information

• This is a digital, VIN-based activation and cannot be revoked once assigned.
• Available via bank transfer only to prevent misuse.
• Activation is delivered after payment confirmation.
• Please enter your VIN when ordering.
• Digital products can be combined. Physical products must be ordered separately.