Hello gang, I am having an issue with our audio system in our baby benz. Slowly the left side speakers lost volume, now we have tryed another Becker unit out of our 420 and get no response.I tryed a dual unit and have nothing but a sputter or clicking sound. I was wondering if it could be the power booster in the trunk giving me all this grief? cant seem to pull up any information,so any help on how to test things out would be a great help. thank you i n advance.