Acoustic treatment

 
noble100 "It's been proven that we don't even hear a deep bass frequency under 80 Hz"

Proven by who and where is this proof were you part of the study that proofed this I don't have a position on this either way but you have not provided proof while others involved in this conversation have provided to you specific references, quotes, and data and if I were you I would not discount, reject, or disqualify remarks made by Vandersteen he is one of the world's preeminent creators, designers, and manufacturers of speaker systems for Music Reproduction Systems.  

noble100" This is from an audio consultant named Bob"

Bob has no data, no studies, no scientific tests, no listening tests, no researrch, no references, hey he's just like you - you must be Bob you gave yourself away! Richard Vandersteen on the other hand has actual calculated, scientific demonstrated success in explaining, showing, and establishing that not all bass is mono now who do you think we should believe you, yourself, and Bob or someone who actually has done the study, work and science!

noble100"Okay, wiseguy. There's lots of scientific White Papers on this subject from Dr. Earl Geddes, Dr. Floyd Toole and others. These are easier to read"

These are very nice links with lost of words and opinions but they are completely and entirely lacking any data, studies, scientific tests, listening tests, research, or references to support you're repeated claims that all bass below 100 or 80Hz is monophonic while conversely others have pointed you to such reliable, repeatable, reproducable data that is very strange that you cling to this notion and again I do not have a firm opinion on this matter but you have failed to support your claim with anything other than silly claims like "it has been shown" and "acousticians have long known" etc.