I have a kenwood excelon x997 comin in as well as 6.5 alpine type r components and a ppi black ice 800.4 as well as all wiring and a ssa dcon 15 hopefully going in a custom built 3.5 cubic foot box now how should I wire the 15 on to the rear channels of the ppi since my dcons are dual 4 ohm

4 ohm bridged on the two rear channels of the PG. 

So I run the wire from only one voice coil since its dual 4 and I believe the amp is only 4 ohm stable when bridged

You have one dvc 4 ohm sub?

I actually have 2 dcon dvc 4ohm but I'm only putting one in my jeep

Now the dcon I believe on ssa site said 3.5 cubic feet for the box ported I'm having this box built so I wanna give them all the numbers so 3.5 cubic feet and I was thinking slot port how many hertz would u recommend I ask then to tune for I'm looking for the most general response on music regardless of type and so you are saying I can't hook up just one voice coil ?