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      01-04-2016, 02:54 PM   #19
TechieCarGuy
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Drives: 2011 E91, 2008 Z4
Join Date: Nov 2015
Location: Florida

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I am not 100% certain, no....but will be finding out soon.

what I understand from reading from others who had the base stereo that one can tap into the signal from the factory head unit at this location. I am under the impression that with the base system, amp is in head unit and is only four channels. front door and under seat are in parallel on two channels, the rear on the remaining two channels.

I am planning to make my own custom wiring harness which will take the full range signal from this location and feed it to a bit 10 processor which can de-equalize signal. if my assumption is wrong, I will find out.

to test thinks I will connect an external speak to the wires under the seat and test; when I get some time to work on it again and let you know.
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