Ok I have messed around with changing the vehicle type from tC to the others. It seems to me that the other car types make the stereo sound louder. When I select tC in my car it just seems I have to turn the volume up a little louder than say like if I were to use xA or xB equalizer settings. Is this common for any of you or is there something I need to adjust. It's not a big deal ... just am kindof curious. Any input would be appreciated.