After reading through all the pages on this thread, I have a few questions and a few conclusions
1. I spent too much time doing that
2. Closing/locking this thread and starting a new one (maybe with the best posts summarized at the start) would be a good thing (and restarting every 100 pages after that)
3. I have huge respect for the many pros (and a lot of the dedicated amateurs) who contribute here
Being at the earliest part of the planning phase (i.e. early education and knowing too many WAF items are in the way of the theater to do it for at least a year) I am trying to educate myself so I can do a full plan up front. Based on couple of items in the intended theater room, I will likely have the space to do some massive superchunk traps. I am contemplating putting in the plans some 4' face traps in each of the front corners.
I would build that by cutting the 2'x4' sheets into 3 pieces - 2 24"x24" [34" face] triangles and 1 34x34 [48" face] triangle. Then alternate layers of the 48" face triangles [face out] with a layer of 2 34" face triangles [face to walls]. That would give me a consistent, fully-filled depth for the superchunk trap. I am assuming that 2 pieces per alternating layer will not impact the effectiveness of the trap.
If I have the math right, 1100/ f = wavelength (l) [in feet]. And these traps are most effective at 1/4 wavelength or deeper. So, if 1/4 l = 2' then f = 1100/8 = 138hz. With less effectiveness as the frequency drops. But we can have some usefulness as low as 1/10 the wavelength [1/10 l = 2'; f = 55 hz] and possibly lower due to edge effects?
Is my understanding and math correct? For a typical ~2500 cubic foot dry-walled rectangular room, this is all a good thing [in addition to more specific treatment as needed for SBIR, early (first) reflections, and slap/flutter echo, comb filtering, etc.]
I am really asking because I have not seen anybody mention doing chunks this big. Conceptually, I cannot think of a reason why this would not be worth doing, it is just an assumption that most people do not have the ability to devote the space for these (only 0.5*3x3x9 = 40 cubic feet