I am looking into upgrading the sound system in my '01 100 w factory NAV..I have already changed out all the speakers except the sub..What I am looking at is a JL Clean Sweep sound processor, 4-5 channel amp and a better sub. What I am concerned with is where have you, that have upgraded your stereo, put the amps, and what sub have you gone with. I am most concerned with space. I want to lose as little space behind the rear seats as possible. I want a really clean, hidden (if possible) installation. I'm not interested in huge subwoofer enclosures, etc..Has anyone gone the route I am talking about? As far as the factory sub location is concerned..Can something better (than stock) be put in the factory location ? I did a search but still wanted to get some more input in case I missed something..... 


