I recently purchased an Alvarez PD80sc, which has System 600T MK II electronics. I love the guitar, but it's my first acoustic electric and I'm not really sure what the optimum setup is for using the electronics. I have a behringer B212a active PA speaker, and when I had my guitar hooked up I was hearing a lot of hissing/noise when I had the volume turned up. It seemed to improve much more when I lower the volume on the guitar, but crank up the gain on the low, middle, and high frequency of the electronics. I was just curious from those of you with System 600T or similar electronics, what is considered the optimum setup for playing live with a PA speaker?

Thanks for your help