Thanks Jayfrigo!
Pages would be:
Page 7 (diagram which he references a lot)
Page 58 Diagram (although I'm not really sure how many leafs this would be)
And then mostly just Chapter 5 "Designing Neutral Rooms" when he is talking about setting up rooms.
Page 144 at the bottom has another diagram.
Now I think he is mostly using these extra layers as LF absorbers....but like you said, wouldn't that reduce the overall isolation?
I also remember reading somewhere (but I can't find the page number right now) that he is talking about using multiple M-A-M structures in the wall so that they all have different resonant frequencies and that they all should cover up each-other's resonances. If your using more than one M-A-M (or M-S-M if you wish) than that definitely means more than a 2 leaf wall. I'm pretty sure he references the page 7 diagram for this.
Note*** I have the 2nd edition of the book.
Any further explanation would be greatly appreciated
Thanks!
Spencer