Originally Posted by Radioactive
Probably not a good assumption. Why would you think the thicker wire is for woofer(you don't have a subwoofer)? More than likely the thicker wires are for 12v and ground. In this post I wrote that I think the woofer wires were blue.http://x3.xbimmers.com/forums/showth...ghlight=woofer
The thick brown/white and red/yellow are for power and ground. I do have two mid-bass/subs under each seat and have been told that the stock amp is 5 channel at 20W and 2 channel at 40 watts for the subs.