Andre posted this link for me in another thread, but I've learned so much stuff from it over the past few days that I think it deserves its own thread. Here's what Andre said:
http://www.box.net/shared/jcaoavdc8g It gets pretty technical in places, with detailed equations (most of which I skipped), but the text and the explanations are excellent, and explain the theory and practical reasons why the experts here recommend all of the stuff that we have learned on this forum. Now I have a much better understanding of why three leaves is a bad idea (it is amazingly better than 2-leaf for higher frequencies, but much worse than 2 leaves for lows, below aprox. 125 Hz, which is where our problems are). I now understand why drywall is so highly recommended, rather than other stuff. I now understand why it is important for both leaves to have the same mass, rather than one with four layers of drywall and one with two layers, for example. I now understand why Green Glue works and ordinary glue doesn't. I understand why wall thickness is important. I understand why we should stuff our walls full of rock wool of fiberglass insulation, and why it doesn't matter too much where you put that insulation. I understand that it is NOT just mass alone that matters, but rather DENSITY that matters. Etc. I understand a whole lot of things much better after reading it. Before, I was just repeating what I had seen the experts say, and only partially understanding the reasons, but after reading this paper, now I "get it" a whole lot better. Now it makes sense. If you haven't read it yet, then I strongly urge you to do so. It is very long (229 pages), it is old (written in 1973) and it is very technical. It is full of equations and diagrams and graphs and tables. It is heavy going. But it is well, well worth the time and effort. It lays out the theoretical and practical basis for most of the recommendations that the experts make here all the time. I would even go so far as to suggest that this paper should be a sticky here, for those who want to understand not just WHAT to do, and HOW to do it, but more importantly WHY they are doing it. Andre, thank you so much for posting it!!!!!! - Stuart - [/quote]"Here is a link to the document on triple leaf equations. http://www.box.net/shared/jcaoavdc8g. You are getting into the deep end of acoustics now. Congratulations and condolences."