"Still works the same, at least at LF, which is what this discussion is about. A monopole is for all intents omni in the main frequency range of the discussion of this thread."
a theoretical point source on a plane is not frequency dependant as you shift from 1/2pi space to 1/4pi space where the point would now be in the fold or as it changes again from 1/4 pi space to 1/8 pi space where the point would now be located in the corner.
in the first case, the sound at all frequencies increase like a half sphere, then a quarter of a sphere, then as an 1/8th of a sphere.
"That Geddes quote uses words such as "like" and "apparent" when describing the pressure phenomenon. I read that as there being waves in the room, just that they act as one."
that is exactly how it works. imagine a wave leaving the subwoofer in slow motion. the pressure begins to rise as the wave moves across the room. but when it hits the opposite wall it is still increasing pressure because the wave is so long relative to the room. so now the wave is reflecting back toward the source and the pressure keeps increasing everywhere in the room. then the second part of the wave begins to exit the subwoofer and pressure begins to fall with the same effect. because the wave is so long, the negative side of the wave is everywhere in the room at the same time.
here are three quick sketches to illustrate. the first picture shows the high pressure and low pressure zones of a wave that is small relative to a room. the wave will ultimately bounce around the room creates points of constructive and destructive interference aka modes.
when the wavelength is long relative to the room, the pressure will be building and then falling everywhere in the room.
"Just place a sub 1/4 wavelength of a specific frequency from a boundary and measure the result."
that is a completely different topic.
"I submit that there is no such thing as 'below the modal region' where sound waves in a room are concerned."
what is meant by that is that if you calculate all the modes for a room, the one with the lowest frequency will be the mode that spans the long dimension of the room (or long diagonal). below that point, there are no modes and you get 12db/oct gain.
"That's irrefutable evidence of precisely predictable, not theoretical, boundary gain at all frequencies and the inverse square law."
boundary gain is a related, but different topic. the topic that i was addressing was how a subwoofer pressurizes a room.
also, please stop telling me what i am saying. i can speak for myself thanks.