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Old 05-18-2009, 12:19 PM   #2
ca1242
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Join Date: Aug 2003
Location: Burke, VA
Posts: 7,633
My Ride: 2003 330i
You tapped in the wrong place for signal. You need to tap into the head unit's outputs (yellow/black, blue/black, both with brown/orange grounds). If the amplifier can not take the oem head unit's balanced-differential signal (most can't), you might need to get an adaptor (i.e. peripheral sven2).
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