[Danilo56]

Hello wurz154, thank you for your detailed thread; I’m about to receive my E91 320D next month and I will replace the six OEM speakers and add four tweeters asap; I think to add a separate amplifier for the two subwoofers (under the front seats) following your instruction as for the connection to the battery. But first I want to replace the OEM Business radio with an Alpine CDA-9854R + steering wheel remote control interface KCE-BMW. My car has no iDrive, no DVD, no CD Changer, no Hi-Fi System and no Logic 7: only Business Radio and 6 speakers.
I have read previous messages and I saw that someone has already made this replacement so I know that I could have some problem.
I have read that a constant 12volts line for the headunit is not prewired and that there is no ignition lead in the power supply plug for the headunit.
Do you know how can I overcome these problems?
Thanks in advance for your reply and suggestion.