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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
ptmconsulting
1,000 posts
 
I'm actually trying to find an answer to a technical problem along these same lines (please don;t ask why, it's complicated). I need to apply a change to my passive crossover to begin rolling off my speakers at 40Hz so that they are down quite a bit at 30Hz.

Anyone have a schematic or an explaination of how to implement this on my crossover?

Thanks,
Bob
dan_ed
2,451 posts
 
Bob, implementing this highpass in a post-amp crossover will require some really large values. To design this correctly would take knowledge of the drivers and the network in use. It would make sense for a poll that low in frequency to look to an active line level crossover solution. There are good ones for a couple hundred bucks.
ptmconsulting
1,000 posts
 
I agree, it's not possible in a crossover. I'd need a cap as big as a house. I'm going to implemnt a line level high pass filter and see how that experiment works out for me.

Thanks
pubul57
3,712 posts
 
I wonder if Ecruz' experience is due to removing (filtering)deep bass from the main speakers and the bass/midrange drivers so they are actually performing better since the heavy burden of producing the deepest bass is removed from the main speakers - the drivers than perform better with lower distortion.
pubul57
3,712 posts
 
"then perform..."
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