Has anyone wired up a sub/amp to the stock system? Is there a wiring schematic out there I can use to figure out which wires to tap into to either run a high level input to the amp or an RCA line out converter? It will be another month or so until my M Sport 335i arrives, but i'd like to start planning now if possible
I'm thinking of adding a small 10" sub in a sealed enclosure (0.5 cubic feet) in the trunk... this will free up the stock speakers to be able to do their job better since the bass duties will be handled by the aftermarket sub