I have a Prius II and hated the sound quality so i started with upgrading my front speakers to the Focal polyglass 165 VR component speakers (+ 2 ch Audison amp to drive them) which I read are great speakers. I expected a real improvement in sound quality but I could barely hear the difference. The sound is still awful and mids are really distorted and the bass is pretty non-existent. Now I am left wondering if it is the head unit that is terrible or if the acoustics in the car itself are really bad. I am now thinking of replacing the head unit and/or add dynamat to the speakers to reduce distortion. I just want good sound in my car !! Any advise on how to improve the sound quality would be greatly appreciated !