I have a challenger convertible and trying to get any kind of soundsystem in there is almost near impossible. I wanted something I could hear with the top down and not destroy the rear panels. After lots and lots of research I found that a component system of 2 tweeters in the front center speaker and mids in the kick panels work great up front. Put an amp in the trunk and a sub in the trunk. For speakers in the back got tricky, but I am going to try underseat speakers, they do fit under front seats. Hardtop is easy, just get a good set of deck speakers.