Howdy Radar...

That Sony unit has 4 volt preamp outputs (front, rear, and sub). Did you patch directly from the front or rear preamp outputs to the input of the factory crossover/amp?

Does ANYONE know what the input specs for voltage are for the Crossfire crossover/amp??? I see heads offered with a wide variety of voltage ratings on their preamp outputs, ideally that should be matched to the Crossfire's input for best sound quality.