Welcome! I'm not entirely sure, so don't take it as gospel, but I think you would need 4 preouts. If the processor has 2 sets of inputs, (for front & rear) then you would miss half since your deck is putting front & rear through one set of A/V cables. You could try usng an A/V Y splitter but then you are putting front and rear sound to all the speakers which will ruin the sound. You could hook up a Sub & Amp with one preout but I don't know how you would hook up an amp for the speakers. Like I said, I could be wrong, but I don't think it would work for you.

The Honkeytonk Monkey - Jewel Green 96se MTX