Has anyone experienced this issue? I owned a 2010 Prius 5 with the JBL stereo. The high's were crisp, mid's strong, low's were chest thumping, and volume was deafening! I now have a 2012 Prius III with the JBL stereo and it doesn't even come close. Yeah it sounds better than my old 2010 Prius II non-JBL stereo (which sounded pretty good for entry-level), but not by much! Has anyone noticed this difference, and what may be the cause? i.e. head unit, speakers, subwoofer?!! Any reasonable suggestions to improve performance?