After about 2 days of searching around and playing with the stereo in the wifes 2011 xB, I finally figured out how to turn on the RCA's in the back of the HU. This HU only has 1 set of RCA's in the back. If you press and hold the SSP button for a few second while the radio is off (make sure to have the car in the acc or on or running position), then the sub connect menu pulls up. We misplaced the manual for the radio and nothing online was helping. We now have bass coming from the back of the car for now. I have a buddy that is building me the under seat sub box. We also installed a set of alpine components up front and a RF crunch amp under the drivers seat. I have added some RGB led's around the front of the interior as well as some pink ones for the wife. Hopefully I can get some pictures later on.