Obviously, the triple leaf effect is not there if the difference between the gaps is important.
In your example it is 16.5 x difference.
In my mastering room, my outer pane is standard 1.1 Saint Gobain double pane glass (I think 8.2-15-4, the 8.2 is for safety reasons), then a gap of about 400 mm, 26.5 x bigger than the thermal pane gap !), and on the inside a thick 15.2 acoustic pane. The inner wall is built on the floating concrete slabe, so there is no acoustic connection between inside and outside.
When my father in law passes in front of the window, with thishttp://upload.wikimedia.org/wikipedia/c ... _Mower.jpg
I cannot hear a thing
I looks as if he is just taking the machine for a walk