We should take this topic elsewhere. (Edit...I do not mean the original thread subject! I mean
our tangential 'digression'!!;-)
But 'spaciousness' is
not created by uncontrolled dispersion! It is created in a small acoustical space (per Schroeder) by the 'creation' of a well behaved semi-reverberant sound field. In bounded space, uncontrolled dispersion is not the same thing as diffusion!
Simply creating a wealth of early and late arriving specular reflections throughout the room resulting in beau coup comb filtering and spatial polar anomalies does not 'spaciousness' make! And it most certainly destroys intelligibility. Otherwise the Bose direct - reflecting model would actually be worthy of respect.
The irony is that this issue is
fundamental to understanding the behavior of sound and intelligibility in a small acoustical space. (...in other words, "acoustics".
) And such an approach has been 'eliminated' for over 35 years - ever since we became able to identify exactly what was happening acoustically within a small bounded space. This concept has become fundamental in the study of modern models of acoustics.
Again, start reading in Davis & Patronis
Sound System Information, D'Antonio & Cox
Acoustic Absorbers and Diffusers. Theory, Design and Application, Philip Newell
Recording Studio Design, Everest
Master handbook...or any number of current texts regarding the behavior of acoustics in small bounded spaces. At some point we need to acknowledge a baseline of acoustic knowledge and not simply be doomed to reinvent the 'acoustical' wheel - as fun as remaining 'a Flatlander' may be...
As far a geographic distinctions, acoustics does not vary with geography. And it is ironic that much of what I refer has been developed by European researchers as well; including, but not limited to, notable folks such as Peter Mapp, Dr. Manfred Schroeder, Dr. Wolfgang Ahnert, Ivo Mateljan, and
many others. America has its own embarrassment in having to live down the 'direct-reflecting' unintellibility technology.