Why the fascination with subwoofers?

LOW bass is pretty cool for HT. I became obsessed with getting 20 hz extension in my 2 channel room and a couple of the big hitters couldn't give me anything below 40 hz even tho JA's measurements showed both these speakers were capable. I brought my big a$$ dual side firing 12" sub into the room and within a half hour I was getting smooth flat measured bass all the way to 20!  All that experience showed me was my can lighting and duct work is noisy and I brought the sub back into the tv room.Now i'm happy with 40 hz extension and find more is less when it comes to deep bass and music.

@rauliruegas 
Not sure why you are attacking atmasphere. He's not selling subs. Over the years Ralph has been as unbiased as I can expect from a manufacturer, even when explaining benefits of a SET, which is a product that competes with his amps. His experience is relevant to me.
Also you are taking words out of context. When he replied " that's exactly how it works" he was answering why subs added depth, etc, which is something I knew too - but the question wasn't pointed to me.

FWIW, over time I've exchanged with several knowledgeable people who do sell subs and don't, listen to their points of views and explanations to help form my opinion and then decide how to try it out myself.

BTW, thanks for the link to the Harman work. I'm familiar with it as I have Floyd Toole's Sound Reproduction. One material aspect of their research was time delay between the subs in the room, which is something I can't do with my setup. Neither can the SWARM system, yet Noble100 and Millercarbon report very good results, so I'm intrigued. In fact mine are Rythmik subs with more tuning flexibility so should do even better. And I do have means for proper measurements.

Regards

Do you use a bus to fly to Chicago? 

Oh and the Swarm system is a bad joke. The people who thought this up have no understanding of acoustics in a usually sized room. It is all about reducing first reflections. All the swarm system does is increase the number of first reflections. The result is mud. It may be powerful mud but mud none the less. 

Really? And you would know..... how? 
Which ones have you heard?