Ok so after looking at all the discussions about the BDA units, there are things that come back a lot. rnrn#1- Two of the dimensions of the cabinet (width and depth) can be modified, but not the depth. I get that, but in the ACDA there are 2 types (10 and 12) what is the difference and why is there only one kind of BDA and not two like the ACDA ? rnrn#2- The dual front walls on the BDAs have two different versions. The first one being two 1/4\” and the second being 3/8\” and 1/2\” what configuration has the most power? rnrn#3- The back wall is a bit confusing. Does it need to be layered? or can it be just like the other walls (1 inch thick) (except the front walls)? rnrn#4- Can the acoustic core be some building insulation like Rockwool or Owens Corning. Of course, these products have to have good absorption coefficients (what are good absorption coefficients?). Most of the given coefficients are from 125Hz to 4kHz. What about below 125Hz?rnrn#5- How much more BDA units should we have in our room compared to ACDA units?rnrnI think that\’s pretty much it! Thank you, Denis, for all the knowledge and if anybody feels I forgot something, please reply. Thanks!