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Small black electronic decoder box with fiber optic connectors and RCA ports

Barrow Mods

Barrow Mods D2B Fiber Optic Decoder Mercedes SL R230 2001-2004 Bose 2 in 1 accessory

SKU CH-7X0D-6KSM3

Converts RCA audio to D2B fibre-optic signal for 2001-2004 Mercedes SL R230 models with factory Bose systems

  • Converts RCA audio to D2B fibre for factory Bose sound
  • Supports Mercedes SL R230 models from 2001 to 2004
  • Includes four D2B fibre optic bypass loops in package
  • Requires professional installation with QR code video guidance
  • Designed for D2B Bose systems, not compatible with MOST systems

Mercedes SL R230 D2B audio decoder

This decoder converts RCA output into a D2B fibre-optic signal so the factory Bose system in Mercedes SL R230 models from 2001 to 2004 remains active after the original radio is removed. It is intended for owners of SL 500, SL 55 AMG and SL 600 variants equipped with the D2B Bose sound system. The unit is not compatible with later MOST-based audio architectures used after 2004.

Compatibility check before ordering

Verify that your vehicle is an SL R230 built between 2001 and 2004 and that it originally shipped with the D2B Bose sound system. Cars produced after 2004 typically use a different fibre-optic protocol and will not work with this decoder. The installation requires accessing the audio module under the armrest and the CD changer beneath the rear left seat, so confirm those locations are reachable in your specific trim.

Included bypass loops and instructions

Four D2B fibre-optic bypass loops are supplied to short the optical plugs on the armrest audio module and the rear CD changer, keeping the factory fibre-optic ring intact. A QR-code video guide and written instructions are also provided, but the manufacturer advises professional installation because wiring varies across model-year configurations. The decoder itself is not a plug-and-play device.

Highlights

  • Converts RCA audio to D2B fibre for factory Bose sound
  • Supports Mercedes SL R230 models from 2001 to 2004
  • Includes four D2B fibre optic bypass loops in package
  • Requires professional installation with QR code video guidance
  • Designed for D2B Bose systems, not compatible with MOST systems

Specifications

No published specifications for this item yet.

Questions about this item

What comes in the box and what must I source separately?

The package includes the D2B fiber optic decoder, four D2B fiber optic bypass loops, a QR code linking to an installation video, and printed instructions. You must supply RCA output cables from your aftermarket head unit and any additional fiber optic cables needed to reach the Bose amplifier and CD changer locations.

Which version of this decoder matches my Mercedes SL R230?

This decoder is built for the SL R230 chassis covering SL500, SL55 AMG and SL600 models from 2001 to 2004 equipped with the factory D2B Bose sound system. It does not support the later MOST optical system used on cars produced after 2004.

What does the RCA-to-fiber conversion actually do once installed?

The unit takes analogue RCA audio from an aftermarket radio and encodes it into a D2B optical signal so the original Bose amplifier and CD changer remain active. Professional installation is recommended because the fiber loop must be bridged at the audio module under the armrest and at the CD changer under the rear left seat.

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