Eventually I'll build my 20 cubic foot LLT. But for now, I want to build a sealed box for my avalanche 18. It'll be run with an EP2500 and a feedback destroyer pro. It'll be used for 80% movies, 10% games, and 10% music. How big should I make it? Right now I'm thinking about a 2' cube. That should net around 7 cubic feet after displacement and bracing. I have two velodyne 10's now.