I have had this head unit for a little better than a year. I am really pleased with the unit overall. However there is something strange worth the volume, there is no change in the volume of the entire system from 25-40 on the dial. Does anyone know if there is something I should adjust on the unit or is it some type of governor on the factory dodge system. I do have a jl audio 1000/1 D amp and a jl audio 12w7 also installed. Any help would be appreciated.