Was in the process of changing out a window regulator and decided to take a look at the speakers in case I want to upgrade down the road. Got a question - there is a plug with four wires going to the driver door woofer. I have figured out which two are for the woofer, but there is also a black/ white wire and a black/ brown wire. Anyone know what these two wires are for??

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!