After installing a new Pioneer DMH-1770 touch screen head unit into my 2008 Honda Pilot, the audio quality suffered. It was distorted and tinny, with no rich bass. After calling Crutchfield, we walked through some solutions and it turns out the main culprit was the Loudness setting, which can be adjusted manually in Settings. The HPF (high pass filter) was also causing a tinny sound, so adjusting that fixed the problem as well.
