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Audi MOST Bang & Olufsen B&O Sound Amplifier
Part with Component Protection
We can prepare an amplifier for your car and remove the component protection; you will simply need to send us your amplifier—even if it is damaged.
Additionally, we offer full repair services for existing units, including those with water damage. Repair costs for faulty units typically range from £150 to £650, depending on the extent of the damage. In our experience, repairing the original unit is often nine out of ten times less expensive than purchasing a replacement.
For a personalised quote, please contact us at info@vagtec.co.uk or via WhatsApp at +44 777 33 666 44.
⚠️ IMPORTANT NOTE:
This unit has Component Protection enabled. It requires removal by an authorized Audi dealership or an independent Audi specialist equipped with ODIS online functionality to activate all features in your vehicle.
Part number : 4N0035466 / 4N0 035 466
Part number : 4N0035466A / 4N0 035 466 A
Part number : 4N0035466B / 4N0 035 466 B
Part number : 4N0035466C / 4N0 035 466 C
The 4N0035466 (and variants ending in A, B, or C) is the main BeoCore Digital Signal Processing (DSP) Power Amplifier. It powers the top-tier Bang & Olufsen Advanced 3D Sound System (VAG option code 8RF).
The full technical data sheet for this hardware unit includes the following specifications:
⚡ Core Audio Performance
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- Total System Power: Up to 1,920 Watts (Peak) / 1,330 Watts (Continuous RMS) at 1% Total Harmonic Distortion (THD).
- Amplification Topology: Hybrid architecture featuring ultra-high efficiency ICEpower® Class-D technology specifically engineered for high-demand subwoofers and mid-bass drivers.
- Total Output Channels: 23 discrete channels.
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- 10 DSP-driven power channels (420W total) optimized for high/mid frequencies.
- 5 ICEpower dedicated channels (910W total) optimized for high-power woofers.
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🎛️ Digital Signal Processing (DSP) Features
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- 3D Audio Engine: Powered by the Fraunhofer Symphoria® 2.0 3D upmix algorithm, splitting traditional stereo or 5.1 data into a complete 3D height profile.
- Acoustic Noise Compensation: Active, dynamic vehicle noise cancellation. It processes real-time inputs from an in-cabin ceiling microphone to adapt volume and equalization curves based on road speed and wind noise.
- Sound Focus Configurations: Digitally adjustable sound-stage mapping (Driver-only, Front-focused, Rear-focused, or Full Cabin Movie/Surround Mode).
🔌 Connectivity & Hardware Inputs
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- Network Integration: MOST150 (Media Oriented Systems Transport) or high-speed Automotive Ethernet fiber-optic bus system (depending on the vehicle build date).
- Diagnostic Code: Referenced in factory service tools as J525 (Digital Sound System Control Module).
- Antitheft Security: Integrated Audi Component Protection lock embedded directly into the EEPROM storage.
🛠️ Hardware Identification
- Manufacturer: Original Equipment Manufactured (OEM) by Lear Corporation / Bang & Olufsen for Audi AG.
- Production Origin: European Union (EU).
- Enclosure Type: Cast aluminum heat-sink chassis for passive thermal dissipation (no internal fan)
Compatible Vehicles
- Audi A6 / S6 / RS6 (C8 / 4K Generation, 2018–2025)
- Audi A7 / S7 / RS7 (4K8 Generation, 2019–2025)
- Audi A8 / S8 (D5 Generation, 2018–2025)
- Audi Q8 / SQ8 / RSQ8 (2019–2025)
- Lamborghini Urus (2018–2022)
Package Contents:
- B&O Amplifier Unit
Brand Information
- Audi
- A6, A7, A8, Q8
- A6 - 4A (2018-2024), A6 – FN (2025- ), A7 - 4K (2018 - ), A8 - 4N (2017 - ), Q8 - 4M (2019 - )
Special prices only for trade customers.
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