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Before mounting the speaker grind off the
peaces of plastic sticking out – this to be able
to place the crossoverbox. Do this now to
avoid grinddust getting into the speaker.
Be careful this is the back of the interior black
high gloss panel. DO NOT GRIND THROUGH IT
!! Take your time and be patient in your
Grind off the yellow arrow indicated area off
the crossoverbox so it can fit.
Doublecheck the fitting of the crossoverbox –
make sure the right bottom side of the
crossoverbox is as deep as possible – as this
is the most sticking out part. Do this right
otherwise you doorpanel won’t fit back in
again. Easy to do but do it right !
Vacume clean everything to remove
Grind off some plastic at the yellow arrow to
be able to fit the Focal speaker and then
mount the Focal speaker (don’t forget to use
the rubber ring between the focal speaker
and the doorpanel.
There are 4 mounting screwholes on the
Focal speaker. The two on the right fit the
location where the rubbers where. Here
some DIY is needed to secure the speaker
Be careful !! Watch out not to screw things
right through your doorpanel !!!
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Wiring, test & finalisation
On your cardoor find the speaker connector.
Cut the connector off and strip some cable
protection. The blue wire with the black
stripe is the -.
Extend this speakerwire with some extra (50-
75 cm) speakercable so you are able to
attach it to the Focal crossoverbox.
Connect the tweeter to the Focal
crossoverbox. The red stripe is the + cable.
Solder some speakerwire to the midrange
speaker + & - and connect that to the Focal
Connect the above extended speakercable to
the Focal crossoverbox (see Focal Manual for
I soldered all speakercable endpoints for
Make sure you tape all connectionpoints with
Before putting back the doorpanel do a test
to ensure everything works well.
Page 13 from 13
Backdoors speaker replacement ?
I checked the interior of the backdoors
Same speaker as front doors
Empty space for tweeter present though – of
course behind a non perforated high gloss
doorpanel – as in a standard speaker setup
there are no tweeters. So Mercedes uses
uniform doorpanels to use with Burmester.
No space for a similar crossover box
installation as in the front doors because of
another less spacious design of the back door
I purchased Focal PC100 (PERFORMANCE) to replace the backdoor speakers … but they don’t fit. The
depth of these speakers is 51,5 mm and that is way too much.
So I will leave the backdoor speakers standard – too (?) hard to retrofit something because of lack of