Well, I've been through 2 line out converters and still, I have NO subwoofer sound coming through my 2000 Jetta stock Monsoon system. I've been trying to add an aftermarket 2-channel amp for the past 3 days and have had no luck. I'm 98% sure I have all the right wires taped to make a clean RCA conversion. How (electrically) can I check my amp to see if it is being a good little amp? Also, I plug the speakers into the input spot on the amp right? Sorry, I'm deseperate for answers.