DD's site say 2.0Ft.^3 would be fine with 2 8's. Not really looking for anything ridiculous, just something that will give me that extra bass when I want it. It's a ported box, tuned to ~38Hz. I'm mainly just trying to save money until I can get my tools from my old boss. It's a cheap box, but built good, my buddy built it for his P2 8's.