Mercedes W203 Subwoofer Installed

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I can't answer the rear fuse box question but would strongly recommend a separate (fused) heavy cable directly from the battery, without this your amplifier will suffer from voltage drop on heavy bass transients, being a class B amplifier this will occur at twice the frequency of the music and cause severe and very audible intermodulation distortion of the amplifiers output. In techy terms its called power supply rejection ratio.

It all depends on what you want to listen to (and how loud) as to how far you go with this, a thumping great farad or so of capacitor wired at the amps power terminals may be of benefit with a very high power unit, I would not bother with this though. Its not to hard to run the cable through the proper cable trunking and while the front seat is out you get a chance to clean all the bits of trim and carpet you cant normally access. • Who Are We? Mercedes-Benz Owners (MBO) Forum, exists for the benefit of owners of Mercedes-Benz cars. Qualification for membership is for owners of such cars and true enthusiasm for the marque. Membership is extended to non-owners with a genuine interest in the best engineered car in the world.

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I want to install a subwoofer box (2 12s) in the trunk of my w211. It has the Harmon Kardon sound system. I have been digging to see if anyone has done it and all im finding is people saying that with the HK system there is already wiring for the sub located on the rear deck and that it is a relatively easy install.

But i have found no one who has actually done it and shown how to wire it to the stock headunit (i have a 09 w the updated command system) If anyone has done or knows someone who has/ is familiar with w211 audio systems any help would be much appreciated!