I took off the rear panel so I could cut into the wires going to the amp so that I could add more speakers up too the amp.. when I opened it and looked at the amp there is a plug going into the top and a plug coming out the bottom what ones (color) wires do I have to cut I don’t have a Schematic that shows what wires are for what so I have no idea can someone, please tell me what wires to go into to get to add more speakers??? Thanks a lot .. it’s a 93XLT with the premium sound speakers but not the additional sub enclosure I believe the amp is 20 watts thanks