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
From a different perspective. Talking about treble say from 15k to 20+khz is difficult. No matter how high you turn up those frequencies you can't feel them as you can with 20 to 60 hertz bass. Also many people can't hear them, which is why there are reports every now and then of teen age girls using 16khz or higher tones for their phones. They can hear them ring but the teachers can't. So it makes more sense to talk about something you can hear and feel than about something you may not be able to do either or both.
Often one will chose to not worry about it initially then tackle it later once all the rest sounds right.

True that most can detect the lowest normally audible frequencies but not the highest as ears age.
Well, in defense of my sex I can say that women only like that "sissy" music
that has "no balls". If we are done now with stereotyping, perhaps we can return to discussing stereo equipment.
My speakers go below zero down to -10Hz thanks to the quad of 36" woooooooofers.

The bass is so low that you can't hear or feel it.

But I know it's there because the Stereophile measurements don't lie.
Even though my speakers are said to go to 30hz, I have often wondered whether cutting them off a little higher and blending in a pair of quality subs would result in not only deeper bass but better defined bass. OTOH, some say it is exceptionally difficult to accurately blend subs and maintain coherent phase. Yes, I like well defined, textured, deep, punchy bass, but can live with slightly rolled highs, as long as they are smooth, brassy when necessary, but never tizzy, grainy or shrill.