baje1

A friend of mine works at a bmw dealer and installled a bmw aux audio plug. When he disconnected the plug in the back of the cd player and connect the aux plug unit the sound from my aftermarket speaker box stopped working( amp was still on though). I talked to the stereo place that installed it(box and amp) and they told me to bring it in with the aux plug to see if they can make both of them work. Is it possible to have both? Thanks guys.