Joe, you haven't described your subs and their input and output provisions, so it isn't clear why you're suggesting those two options. The Denon FAQ you reference certainly doesn't suggest that; it gives the advice, which is generally best, to set all speakers "small".
It would seem that a "Y" connector to the 3802 sub out should feed a sub cable to the line-level input of each sub. All speakers should be set"small" and fed with regular speaker wire from their respective terminals on the 3802. The 3802 crossover should then be set at 80hz and the sub crossovers bypassed if they have that provision, or if not, turned up to the max to be as far out of the way as possible.
