So, I'm in the process of trying to build a tuned box for my sa8v2. I'm new to all this tuning stuff so, I'm not sure on all the specs. recommended volume is .6 to .75 and that is tuned to 35hz. I've been using the12volt.com calculator to give me port dimensions for a .671 cubic foot box I designed. The port is 1.5 inches wide and is 39.5 inches long (according to that calculator it's tuned to just under 35hz) After reading more about this sub, I saw that people were commenting that there should be around 20 sq inches of port area?? I've got way more than that. Anyone out there that has a spec box for an sa8v2? If not, I'll just need some more info from you experienced audio people! Thanks Oh, yeah, and I also emailed Ram designs with some questions. Are his designs any good?