//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif no he said i could use it to try and get info so i can make the best out of my system
That's exactly what I was thinking then I scrolled the page further down and saw that the Squeakster had already posted it.
Use the single P12 Dual 4,wire the coils in parallel to get a 2 Ohm nominal load, and run the amp at 2 Ohms (which is the lowest impedence it is rated to run at stable) and call it a day.
If you're going to go with a second Dual 4 Ohm sub then you're going to want to get a different amp as that Audiobahn won't give enough power at 4 Ohms to satisfactorily drive a pair of those Orions.