Currently using an SPA250 for transducers and just bought this to replace it. After connecting all wires and plugging it i get nothing, the amp is on but transducers arent working. I am using a 4 pole speakon connector and i have all 4 wires connected so i could test the trans but no matter how i connect the wires i get nothing. My sub cable is going into a 1/4 adapter and i am using channel a i did try channel b as well. Do i need to change any settings on the amp or is it supposed to work out of the box?