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E85 / E86 BMW Z4 – Android tablet integration

Hi, I'm new here and I found this great thread about integrating the Junsun V1 Plus Car Radio for BMW X3 E83 2003 into a Z4 E85. I already have everything at home, but now I'm trying to figure out how to connect the high-to-low converter to the cables. Do you have any wiring diagram for where to connect it? I assume the amplified output from the Android radio needs to be reduced so that the original amplifier doesn’t have issues and the sound doesn’t get distorted. I tried it without the high-to-low converter and the sound was also good, but I’m worried the original amplifier might have problems at the final stages.
 

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