Last year I was running the T2 on a 1501BD in a box that was 4.3 cu ft tuned to 30 hz with a 4" ID PVC pipe that was 6.5" long. Let's just say the box ******.
I built RF's recommended enclosure for it a while back and it was a lot louder than my first box. Their box is 3.25 cu ft slot ported...