Here is a link that might be able to give you a starting point. http://www.soundsolu...ation/icon.html I would choese 3/4" mdf that can be found at any hardware store. Generally, I would install in the largest enclosure I could fit, within the recommended listings of course. You should tune to whatever is your prefrence and your goal. I find 34hz best for daily. If you like ultra lows, maybe a 30hz tune. If your going for numbers, well you'll most likely be tune much higher, above 40hz normally. And I don't know how to answer your "etc." question lol