Hi Robert.....I did away with the idea of RE audio subs. Been going through different DIY projects and it seems Dayton Audio wins hands down in price/performance area. Have you had any experience with any of the following drivers? - Dayton Audio RSS460HO-4 18" Reference HO Subwoofer 4 ohm - Dayton Audio RSS390HO-4 15" Reference HO Subwoofer 4 Ohm I can get these drivers here, that's no problem. Use will be 80/20 for movies/music. Objective is scary loud and flat output till at least 20Hz. A lot of people talk big about sealed design, but I prefer the ported more coz of immense output below 30Hz. Room size is 23'x16'x12'. How much woofage do you think I would require i.e. one 18"/15", two 18"/15"?? Btw, I completed my other project (Alpine DIY) you helped me with. It only awaits the final paint job. I will post the build pix and FR in that post.