I have had two type R setups, 2 12's and 1 12. Both ported, one to 32 in 2.5 cubes and 2 12's in 3.2 cubes net tuned to 38.
I am running now 2 SA 12's @ 1ohm off an Orion 2500d. Subs are in 1.5 each tuned to 30 hertz. I still need more power (getting 600+ to each sub) / I am praying for Jacob...