I had a friend install my car audio system for me since he had done it before, I was not with him to see the install so I'm hoping this is a common problem in installing/setting up your car stereo. I have a Clarion DXZ785USB dash installed with 4 6.5in Alpine speakers. The problem is that it sounds like shit, there is absolutely no bass, and when I turn the volume up the speakers distort - without any bass to begin with. I have tried messing with the settings in the head unit, I have the bass as high as it will go and it makes little to no difference in the sound. Anyone have any ideas? Thanks!