hey, i had that same problem, everything was connected right. I took the sub out if the box and checked the wires connected to it and all the fuses. I got a multimeter and tested power and the wires themsleves. Everything was fine. To this day i do not kno what was wrong, but i got a new sub and the amp worked fine so its the sub itself or the wires. And when i pulled my sub out of the enclosure, it was all bent up, like the tube that connects to the voive coil, so that was probably my problem.