Moin Moin, after I’m through with the exchange of the interior equipment now comes the sound system. In addition a question: I looked at the amplifier in the trunk yesterday. From the amplifier 2 light conductor cables go forward as well as a quite thick plug with the box cables for the doors. On the radio front however no light conductors go away with me. There are also only normal strands for the boxes connected. Where does the light conductor cable go? How to get an Aux connection after I have found it here by now click . but : since the sound does not seem to go over the light conductors with me, can I switch behind the amplifier a small power amplifier again, together with the new boxes that I have installed should this already result in an enormous sound improvement or?