So I'm not sure what I'm doing wrong, but I'm not getting any audio to my sub amp. I've tried everything I can think of. I'm running a line output converter from the factory amp sub outputs with the rca going to the new amp. I know it's not the rca cable because I tested with a multimeter. I know it's not the amp because it's brand new with power going to it. I've tried both sides of where I have cut on the splices. I don't know. Any ideas?