I need some help from the cab gurus. I have 2 Eminence Neo Deltalite II 2512s. I have a local guy that builds cabinets and I am looking at building either 2 1X12 or 1 2x12 birch sealed cabinets. I just need to check my calculations. What would be the optimum interior size for the 1x12? and the 2x12? Any other comments/suggestions are appreciated. If it matters, I'll be playing a TH500.