I have in my 156 (2003.) BOSE system (amp + sub + changer), and standard 8 speakers, HU was with NAV. I needed to change this old one (it's broken) with Alpine IDA-x311rr.
And there is where my problem starts
There were 3 connectors on the back of HU (Blaupunkt):
1. ISO-DIN connector for power
2. orange connector - thinner and longer that DIN (I found out it's for cd-changer!)
3. 3 mini connectors (RCA?) yellow, blue and green
- there is ussualy second ISO-DIN connector for speakers (but not in BOSE installation!)
I didn't know how to connect speakers to my new HU, because there is no second ISO-DIN (for speakers). Everything was connected trought those 3 little connectors...
From what I could find on the internet, i figured yellow is for AMP, blue one is for CHANGER, and green is for steering controls.
NO speaker cabels!
Next logical thing is to think all the speakers are conncted trought the AMP, and have LEFT and RIGHT channel and (12+, grounding) on that little yellow connector.
So I bought ISO-DIN connector, harvested the wires from that yellow connector and connected it to ISO-DIN (LEFT channel is now connected as a FL speaker, and RIGHT channel is now connected as FR speaker). I also connected 12+ on the white-blue wire (from HU) and grounding.
So at last i was able to hear something!
But... now I don't have any BASS coming out of speakers (I also think SUB is not working now - i have to check that one more time to be absolutely sure). And speakers on the rear shelf aren't working aswell.
When I turn up volume up just a little bit (for example 5 out of 35), sound is preety loud (it's clear though..).
I assume it's beacuse Alpine HU has it's own amp (mossfet), and it's connected to BOSE AMP, and then to spearkes (basiclly : HU (with amp) - AMP - speakers).
My question, is there any way to work this thing around or to correct it? Configure BOSE AMP, rewire? So that I can have normal bass in speakers, have all 8 speakers + SUB?
I am very sorry for the long post, but I wanted to explain my situation and to be precise what I need.
I didn't find any post with this kind of problems.
Thanks in advance for any kind of help!