hey guys, does anybody knows the way it originally comes from the factory? when I bought my car (1988 735iL) it came with a cassete player (not original), and i decided to replace it to a cd player. i realized that they used only 2 channels of the stereo amplified output and it goes to a little original switch that divides the sound to the front and rear speakers. so it seems like i'm overloadind the stereo couz i'm loadind 4 speakers from 2 channels only. do the car have an amplifier?? maybe i'm feedind the amplifier with an amplified signal?? that's weird, isn't it?? what do u guys do when u change the original stereo to a new system using the same speakers? any kindda help is appriciated. !