Thanks, Dev for taking the time to advise! I already tried this though. All that does is control the volume for Android Auto, which is the same as simply turning up the volume with the knob (i.e.: when I go back to Android Auto after I adjust it, the volume matches the number I chose on the Phone Projection screen). The problem I am having is that there is np bass or depth at the same volume where the radio is blaring. I have actually benchmarked this. I go to a random Surius XM channel and find a good song, then find that on Spotify. I switch back and forth between the two audio sources, and let me tell you, it's like night and day. I am wondering if Harmon Kardon didn't program the system correctly, like the amp settings are different for the radio than they are for Bluetooth and Android Auto. I have the same problem no matter which I use. I'm truly at a loss. I've warmed up to the car and decided I like it, but this has really got the better of me. I know it's not a blown speaker or sub or amp, becuase the sound with satellite radio is quite excellent.