In my glance, I noticed that nobody mention SPL levels. Just because a speaker can go down to 30hz, does not mean it can do so with any authority or cleanly at listening levels. I can build a 5 1/4" subwoofer that will go down to 20hz, but it will only do it at 60dbs or so. To get 100 dbs at 40hz takes at least a single 12" subwoofer with pretty good excursion.
Many high end speakers at decent volume levels will play the 2nd order harmonic nearly as loud as the first. So often what people mistake as hearing as 30hz bass is the 60hz harmonic. In most acoustic music there isn't a lot of bass below 40hz,but you do get ambience from the sub bass of the room when you have speaker that reproduce it.
As far as obsessed, you haven't seen anything. Go over to the AVS forums and see what those nutballs are doing. Most want to be able to produce 115dbs at 20hz and some are getting 120dbs at 10hz. They are now pushing below the 10hz level, some as low as 5-6hz. Whatever you do over there, don't mention anything about amps sounding different or cables, you will get piled on.
Many high end speakers at decent volume levels will play the 2nd order harmonic nearly as loud as the first. So often what people mistake as hearing as 30hz bass is the 60hz harmonic. In most acoustic music there isn't a lot of bass below 40hz,but you do get ambience from the sub bass of the room when you have speaker that reproduce it.
As far as obsessed, you haven't seen anything. Go over to the AVS forums and see what those nutballs are doing. Most want to be able to produce 115dbs at 20hz and some are getting 120dbs at 10hz. They are now pushing below the 10hz level, some as low as 5-6hz. Whatever you do over there, don't mention anything about amps sounding different or cables, you will get piled on.