Hello, I had to bring this question those more knowledgeable of the subject.. unforatenly that means you guys

I have a 1990 535i that has the factory amplifier and and 11(?) speaker sound system.. The guy I just spoke with said I will need to do some rewiring and bypass the factory amplifier completely.. because the new Head Unit has an internal amplifier. sound legit?



I am looking at an Alpine CDA-9847,



CDA-9847