I have been looking at the website for the tempests, but have been unable to find any of their design plans. I know very little about this stuff, but really want to learn. I want to build sealed down firing sub box. I was hoping to find a list of materials and instructions any help at all regarding DIY subs would be great. I also wanted to add what a great forum this is. I just found it a few days ago, u guys have been a great help already. HT enthusiast and DIY'er in training!