Well, I got my dual DIY tempest all hooked up, turned on my mackie m1400i, and heard....nothing. The power light comes on, but I get no signal lights for either chanel. All the switches should be in the proper position. I tried it straight from my marantz av-550 and through a paradigm x-30 xover. I've got rca's from the preamp to the mackie with 1/4" adapters on the end. I'm thinking maybe the output voltage of the home equipment isn't working with a pro amp, but I don't really know much about pro gear. Any suggestions?