I have a American Pro Bass Machine 1000W 4 channel V.S. 1596 amp wired to two 450 watt speakers in a box, the only thing Im missing is a car. so I want to plug my home stereo wires into the RCA imputs. The only snag is the power source. I have a universal AC adapter that puts out 12v and have attached the bare wires to the power and ground screws. But no green light when I plug it in?