acuraspeed604

hey everyone i searched through the diy on the loc and the one discribed say it only have 4 wires mine has 5 and the 2 rca plugs i got it for 10 bucks lol could anyone give me a quick way to hook it up properly can you tap into the stock sub and have it still working or do you have to tap into the rear speakers whats the best way to have this thing hooked up and im just making sure what the 5th wire is thanks everyone http://www.revscene.net/forums/showthread.php?t=544272