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Coupe stereo - use aftermarket headunit amp? (archive)

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Posted by Sub on July 31, 2001 at 04:32:04:

I've got a Sony CDX-M750 in my Coupe... since I don't listen to my music very loud, I was wondering if I can use the headunit's amp (50 x 4) for the speakers while hooking up a separate amp for the sub.

My main concern is getting everything to fit w/o using trunk space. I'm going to put in an Image Dynamics IDQ8 into the stock sub box... the amp is now the issue.

Does anyone know how to remove the headunit? I had a shop install it for me (it was free and I knew nothing then), and they told me that it required a special tool to take out the headunit... is this true?

I'm assuming that like other cars, my Sony is connected to the stock speakers through a harness (and that BMW does NOT use RCA cables to connect to the stock amp). I'm also assuming that the stock headunit did not contain an internal amp and used the external amp exclusively. This brings me to a question: I think I saw the installer simply snap a harness into the Sony and into the BMW harness in the car. Does this mean that the Sony's amplified outputs (non-RCA outs are amplified right?) are now feeding into the stock amp...?

I hope this makes sense to someone out there. A schematic of the stock stereo system would probably clear everything up... but I can't find one. I would also like to just pull out the Sony unit I have now and see how the connections are made behind it, but I can't get it out... and I don't want to damage anything.

HELP!!!!!!!! thanks!

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