Hi folks,
Wrapping my head around the stock CM5908 in my 91 318is.
The car seems to have the premium sound package (speaker pods, external boxes on hat rack) but does not seem to have the stock amp. PO had run a cheap Sony unit with new wiring (thankfully left existing wiring in place). I'm bringing it back to "stock" but with new life.
I know the CM5908 has high level speaker outputs which makes it special, and a pain in the arse.
I have to still verify existing wiring. With the CM5908 plugged into existing harness I have sound coming out but it's fairly low. Could be the radio but also could be that the amp isn't there or isn't functional. Need to trace it back (I believe it's a straight run between HU and speaks?). I don't have a wiring harness that goes to the driver's side rear trunk next to the power antenna (which is where I believe the stock amp lives).
I want to direct the sound to the LC7i (basically an LC6i but with a 3rd channel + accubass) and then to the Alpine amp and to the speakers. I have a small powered sub that I will plug into the 3rd channel via RCA.
I believe that I need to take only the + from the speaker outs on the CM5908 and run those to the LC7i.
I have found posts from bmwman91 on building custom RCA cables with proper shielding and I plan to have the LC7i very close to the HU (not sure where yet).
Can anyone confirm that this is the approach? I believe the Alpine handles high-level inputs (differential) but can't find reference as to if the LC7i does that. I want to clean up the signal and pull out bass too, which is why I want to keep the LC7i (and I have it already too).
CM5908 --> LC7i --> Alpine MRV-F300 --> 2 channels speaks (front/rear)
All thoughts appreciated! I'll probably test it all out of the car first but if you have insight I'd welcome it.
~Jason
Wrapping my head around the stock CM5908 in my 91 318is.
The car seems to have the premium sound package (speaker pods, external boxes on hat rack) but does not seem to have the stock amp. PO had run a cheap Sony unit with new wiring (thankfully left existing wiring in place). I'm bringing it back to "stock" but with new life.
I know the CM5908 has high level speaker outputs which makes it special, and a pain in the arse.
I have to still verify existing wiring. With the CM5908 plugged into existing harness I have sound coming out but it's fairly low. Could be the radio but also could be that the amp isn't there or isn't functional. Need to trace it back (I believe it's a straight run between HU and speaks?). I don't have a wiring harness that goes to the driver's side rear trunk next to the power antenna (which is where I believe the stock amp lives).
I want to direct the sound to the LC7i (basically an LC6i but with a 3rd channel + accubass) and then to the Alpine amp and to the speakers. I have a small powered sub that I will plug into the 3rd channel via RCA.
I believe that I need to take only the + from the speaker outs on the CM5908 and run those to the LC7i.
I have found posts from bmwman91 on building custom RCA cables with proper shielding and I plan to have the LC7i very close to the HU (not sure where yet).
Can anyone confirm that this is the approach? I believe the Alpine handles high-level inputs (differential) but can't find reference as to if the LC7i does that. I want to clean up the signal and pull out bass too, which is why I want to keep the LC7i (and I have it already too).
CM5908 --> LC7i --> Alpine MRV-F300 --> 2 channels speaks (front/rear)
|
|-----> Powered Sub
|-----> Powered Sub
All thoughts appreciated! I'll probably test it all out of the car first but if you have insight I'd welcome it.
~Jason
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