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"...My MF channel is crossed well above secondary resonance – at  3200Hz... I get my 1000Hz by gliding the filter-declining slope of the secondary resonance..."

I know this... What I'd really like to see is that by further unloading the lower end of this channel, you'd once again try using the all-metal diaphragms. I'll let you figure out where I'm going with this (hint; injection channel).

About the 500Hz that might be handled by ether MF or Fundamental channel: Yes, I admit, at first glance it does seems like small potatoes, but at this frequency range, an additional 500Hz represents half an octave. More importantly, an S2 with a 180Hz horn working in this range simply must be heard; my guess is you'd want that horn doing the job.
 
"...I think that you are taking not about the vertical axis but rather about radiating surface..."

I'm talking about radiating surface(s) distributed along the vertical axis, in the interest of conveying depth. My point is that we perceive depth in audio in large part due to the relative vertical relationship of sounds.

"...I wrote about it manse times – larger radiating surface when Sound comes not from a single point but from a large “cloud” is much interesting configuration. Unfortunately, due to the physics of our hearing (the position of ears) we can increase the size of the cloud only in vertical plane..."
 
Our ability to locate the origin of a sound to the left or right is superior, but despite the horizontal disposition of our ears, we are able to perceive and differentiate between sounds coming from above and below (hence the fear of a perceived vertical image center in heaven or hell). We regularly make use of this faculty to recreate the illusion of depth in audio, and we just as regularly deny it.

Reality or illusion, the concept of depth automatically invokes a minimum of three, non-collinear points in space.

jd*

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