Pbb has a good point, what is the most reasonable range, which he says is 30hz through say 16Khz. Hoover joins in with agreement and is hapy to see someone actually post this. My speakers go to 40hz and so far have been satisfactory enough. IOW when I play the New Orleans Jazz complitaion and another compliation Blues cd, both very high quality sound recoding, the bbass fills the room. Thats at between 1/4, 1/3 volume on my 40 watt tube amp. But considering I mostly listen to classical, i'm now ready to get at those fq's from the bass, cellos, tubas, timpini's, the 30hz-40hz. IOW I want a new experience from my classical with that added bass. Now the 20-30hz's I'll be missing. But as Pbb mentions just how important are these super low fq's, how much will they be missed? How often in classical are these fq's there? In solo piano there's not much below 40 I'm sure. Yes the piano can go as low as 20, but how often do composers work in that low fq in piano scores and even in orchestral. Rarely.
And the upper range, who knows from human hearing when a tweet rolls off at 20hz, and other tweets at 22Khz? I'd guess on the jazz and blues cds there is more going on in the 20Khz+ range than in my classical. But those tweets that go up to 22Khz+, are they delivering quality superhighs, 22K-25Khz? Are are the highs sort of "fake" sounding, tinsel-y/ metalic, IOW fatigueing? That is do tweets that go as high as 25hz+, is that upper range for real? Also is they are designed to go too high, then how well do they meet the mids of the lower drivers? Which is why my seas' tweet does not sparkle, but instead has a bigger bottom end and meets the midwoofer with seamless resolution. I do not lmsii the 22hz+ that the Seas seem to not deliver on.
So I'd say full range is 30hz - 18Khz as Pbb mentioned.
I'll read the other posts here. Some great comments are being made and we are carrying audio one step further to a PROPER understanding. For too long audio knowledge has been in the dark ages, and audio labs have taken full advantage of our ignorance and pushing its bull on us.