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Mercedes-Benz S-Class W221 Fibre Optic MOST25 Decoder Box for Aftermarket Stereos
SKU: ACFOBMS01
£109.99
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SKU: ACFOBMS01
Key specifications
- Network
- Fiber Optic MOST25
Functions
- Built-in amplifier
What you need to fit this
1 · In the box
- 1 x Decoder Box
- 1 x Power Supply Cable
- 1 x Fibre Optic Loop Male & Female Connector
- 1 x Fibre Optic Loop Female Connector
- 1 x Adapter
- 1 x User Manual
The XTRONS ACFOBMS01 is a MOST25 fibre optic decoder box for the Mercedes-Benz S-Class W221 (2005-2013). It keeps the factory amplifier and fibre optic network working after you fit an aftermarket stereo, so all the speakers still play.
- Keeps the W221's factory amplifier system after a stereo upgrade
- Keeps the fibre optic network running
- Plug and play, with the connectors and adapter included
Keeps the factory amplifier working
In the S-Class W221 the factory amplifier is linked by a fibre optic network. Removing the original stereo breaks that loop, which can leave the speakers silent. This decoder box keeps the factory amplifier system and fibre optic network working with an aftermarket stereo, so the sound still comes through every speaker.
Fitting is plug and play. A power supply cable, fibre optic loop connectors (one male and female, one female) and an adapter come with it.
What's in the box
- 1 x Decoder Box
- 1 x Power Supply Cable
- 1 x Fibre Optic Loop Male & Female Connector
- 1 x Fibre Optic Loop Female Connector
- 1 x Adapter
- 1 x User Manual
| Network | Fiber Optic MOST25 |
|---|
- Mercedes-Benz S-Class W221 (2005-2013)
| Make | Model | Years | Notes |
|---|---|---|---|
| Mercedes-Benz | S-Class (W221) | 2005–2013 |
The decoder box is plug and play. It links the new stereo with the car's fibre optic network using the power supply cable, fibre optic loop connectors and adapter in the box.
Why do I need this with a new stereo?
The W221's factory amplifier runs over a fibre optic network. This box keeps the amplifier and network working once the original stereo is replaced.
Which cars does it fit?
The Mercedes-Benz S-Class W221 from 2005-2013.
Full specification from XTRONS
XTRONS's own pages for this product, as the manufacturer publishes them. Open any of them at full size to zoom in.






