I am stuck in an unusual situation, I have a 2006 G6 base with the V6. However my interior displays are 2010, I have the 2010 gauges, radio, and climate control. Recently the Bass in my rear speakers have stopped working when they are balanced evenly. If I force the balance either all the way to the left, or the right, the individual rear speaker will have Bass, when they are both supposed to be working no Bass. All other audio still goes through speakers. Any ideas? I did all the above modifications myself and had to create a method for the radio to work, I'm open to try anything that could work. To my knowledge there is no amp in the car.