What is this connector on Symphony II?

davidisurf

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I just swapped my concert I to Symphony II and on back of the Symphony has this connector(see picture below) and I don't know what is it for?
My car Just have the regular antenna 50ohms and no other cable that can fit in this connector, do I need this for something?
photo2.jpg
 
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It's actually a Fakra aerial, the newer Audi HU's use 2 different aerials, one ISO and one Fakra. You don't need it, unit will be fine with just the ISO.