Ok I finally got my DIY atlas 15 box built and everything set up. To use a plate amp all I have to do is plug it into my subwoofer preout using a RCA to one of the line ins on the plate amp and also turn up the volume on the plate amp right? Oh yeah I plugged in the amp to a socket as well. My reciever is a Yamaha rx-v650. With my other power amps I hooked them up the exact same way and they work fine without having to turn anyhting on. The sub is sealed up tight , the wires from the amp to the speaker are hooked up and everything. anyone have any ideas?