Is this why my analog rig isn't so hot?

Dear Doug: I agree with yourmama on this 16Hz subject: for any one can " hear/feel " a clean 16Hz frecuency it has to have not only the audio system that has the capacity to do it but it has to have the room for that frecuency and their harmonics can " form ".
I don't know nothing about your room but your audio system ( like a whole system ) certainnly ( I'm sorry, but the english is not my native language ) can't to reproduce a clean 16Hz frecuency by any circunstances. It is not a matter that " 16Hz test signals become progressively less loud ": by physics law your loudspeakers can't do it, period. As a fact there are only a very few subwoofers that can do it in the right way.
Doug, here you are talking about to reproduce the most difficult task for any audio system even with subwoofers.
Regards and enjoy the music.
Raul.

So what are we hearing then?

harmonics of different fundamental frecuencies.
Raul.

Yourmama,
I forgot to remark about one of your points: some Teres tables include acrylic and some don't. Mine doesn't. Check my system.

Doug,

I guess I need to clarify my 60hz-70hz comment, I know the B&W published specs, but that's not the same as true bass. Of all the speakers that I know I can only think of a couple which can do even 40hz of real bass. As Raul so nicely explained, bass is extremely difficult to reproduce and it has all to do with physics. You need volume to reproduce bass and most speakers are too small to do that, only something the size of a Wilson Grand Slamm can start to approach 40hz bass, that's if your room can support it. Low bass is going to be a bitch, the best sub 40hz bass I've heard was from giant horns of 7-8 meters long, even then there was precious little below 25hz. I'm not counting fundamental frequencies, just true bass. I'm sure you've seen a pipe organ or two in churches, please note the size of the pipes that reproduce the low notes!

Raul- You mentioned subwoofers that could reproduce proper low bass, what have you heard?

Mama