I recently purchased a 2016 X5 40E with the basic sound system and it is okay, but I have a history of installing my own sound systems in every vehicle I've ever owned and honestly the sound in this car is sub-par, pun intended.
I've always owned vehicles where I could easily swap the head unit, or at least splice the speaker cables from the factory head unit and solder RCA's and run to an audio converter. However, this car is much more technologically advanced and I simply do not want to screw anything up.
I've researched multiple add on installs and feel pretty confident about what to do and have purchased a Line out converter and amplifier install kit. I just need to know
what cables to tap from the factory amp for the left and right subwoofer + and - . I plan to use the mirror fuse tap for the remote wire as it is only on when the ignition is on. Power and ground will go to the battery, which is very convenient as they are in the rear.
If anyone has diagrams, pictures, or links to the aforementioned I would be incredibly grateful!!!