Is this really worth it? I mean, I could use better sound in my car. It's a 2001 ranger and to be honest the sound isn't that bad, I hear the bass, I hear all the cymbals and I hear whatever else I need to hear. Will a "huge improvement" in sound quality come out of investng in a 300 dollar system? Do I need an amp or can I just get replacement speakers? I really have no idea of anything in this area. Anyone who wants to chime in...would be helpful.