Hi. I am looking at Pioneer car radio models to replace my becker audio 10 and speakers in a 2003 CLK. As much as possible I would like to maintain the number of speakers I currently have installed in the car which are 7 (2 tweeters + 2 front + 2 back + 1 Subwoofer). Some pioneer units have RCA outputs. Can someone who has a Pioneer unit please confirm if these RCA outputs are in addition to the main speaker outputs or if they are the total number of available outputs? Thanks.