My first question is about the set up that I have. I have 6-CD changer MP3 head unit, but I don't think I have a sub (couldn't hear any bass). Do I have any preamp connections, and if I don't is there any way to get preamp from this head unit (I don't want to loose sync)? I have all infinity system (4 speakers, 2 subs, and 2 amps) from my previos thunderbird setup and don't want to loose it. It's 5-year old system, but it still sounds great and I spent fortune on it. Any help would be apreciated. By the way I love my Edge, awesome car.