Hey Chris,
I'm not sure exactly how the inputs work on that specific unit, but to the best of my knowledge, you would likely just feed it a full range input (Front or rear - not sub) and you then run the outputs to you amps accordingly, from you EQ.
How are you looking to control the volume? From the head unit or from the EQ?
I assume you could likely do both, but you would have much more consistent sound if you chose one, and left the other at a specific level.
If you can get/have pics of the input/outputs on that Eq I can expand more on how to wire it up!
cheers,
85 SunSport - "Under Construction"