Hey gang I just bought a powered subwoofer to put under my back seat. I have the factory delco tape with cd in cubby hole. Everything works fine but could use a tad more bass. Question is where can I tap one of the rear speaker wires for a signal for the s/w? I tried to remove trim around back fact speakers and no luck. Do the factory speaker wires run under trip plate on floor next to door? If yes which side? I have done a search but cannot find anything. I know I will have to run clean power from under the hood. Thanks in advance.