ooookay, I got everything hooked up.. amp working, line out converter hooked up to the factory stereo, sub connected to the amp.. I turned on the car to test it out and ...... the sub doesn't work??? the amp is on and nothing is coming out of the sub?? could it be the line out converter? it's tapped in to the rear speakers. tried turning the "signal" knob and still nothing?? CAN ANYONE HELP ME!! PLEAASE!!!!