I have everything setup the way it should be except for the high output converter box.. I am using the stock HU because i just bought the car and don't want to spend money on a new HU right now. So when i tried to splice into the rear passenger speaker for the rca inputs it doesn't work.. I have read that the bose system is more complicated than the non bose system. I am trying to find out what speaker i can splice into, if any or some type of solution for my current setup.

Please help me