Pioneer Rca Input Adapter

Im hooking up an amplifier to my car?

im hooking my amp up in my car and i need some help. I have a motorjoy gto-8672 amp with a pioneer head unit. I have an output converter because my head unit dont have rca adaptors. I hooked everything up. My amp lights up, but nothing is coming out of my speakers. My converter has 6 wires coming out of it. It has a white +and – and a gray +and – i hooked those to my right an left rear speakers white to left and gray to right. It also has two brown wires running out of it that i dont have any idea what to do with. I used the rca cables and ran them to my amp. Im not getting anything out of my speakers. My amp is 1000 watts. I have two 12″ speakers. Can anyone figure out what is going on? I also have a high input port on my amp, but i dont know what to plug into that. I guess i have to buy another adapter so if anyone knows anything about that. I would appreciate it.
The high level input is a plug. It has six prongs. I dont know what to hook to that either.

Try running the rear speaker out put wires from the head unit to the amp HIGH level input. Is the gain turned up on the a