Why the obsession with the lowest octave


From what is written in these forums and elsewhere see the following for instance.

Scroll down to the chart showing the even lowest instruments in this example recording rolling off very steeply at 40 Hz.

http://www.homerecordingconnection.com/news.php?action=view_story&id=154

It would appear that there is really very little to be heard between 20 and 40 Hz. Yet having true "full range" speakers is often the test of a great speaker. Does anyone beside me think that there is little to be gained by stretching the speakers bass performance below 30-40 cycles?
My own speakers make no apologies for going down to only 28 Hz and they are big floor standers JM Lab Electra 936s.
mechans
Not that I'm saying he's wrong, or for that matter that he's correct, but for those that might not know, JohnK is a manufacturer of bass horns.
Could just say I'm honest. Not like folks buy giant bass horns from wee forum posts, bass horn owners have to be partly crazy but dedicated.
It is commonly said that a large driver, say 15", is "slow" because its cone is so heavy. Nonsense! My 15" drivers have huge magnets and 4" voice coils, and the strength of that "motor" greatly exceeds the effect of increased cone mass.
No slow woofers, I never experienced this. In any woofer up to 31.5in in size. The slow woofer line has been passed about and is BS.
Martykl, not referring to you earlier. Someone else linked T. Rex foot falls and human hearing. BTW, I think your 1/21 post is very accurate.