The skepticism is warranted.
IMHO - Big-E speakers may work well in-spite of the evidence they a "Vortex"
ALEX SALVATTI, ALLAN DEVANTIER, DOUG J. BUTTON,
For example:
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Vortex Shedding is mentioned, there is even diagrams, and the references give several Studies, Papers, and Patents from engineers who design to minimize it.
Vortices are not sound waves, they don't travel at the speed of sound. They interfere with port operation. The evidence is to minimize any vortex. It's been studied.
If you follow the patent trail the above document you'll find big makers suing each other over designs that minimize any vortex. That's a lot of dough over this.
IMHO - the vortex ploy isn't what Big-E should focus on.
Actual measurements and performance can go a long way.
The paper you linked to is one of the reasons why I use flared ports, but it's not the main reason. The main reason is, I have
observed audible advantages to flared ports.
I am not involved with Big E technology because it was explained convincingly to me or proven to me in some way. On the contrary, I have enough technical background to recognize that what they claim doesn't make a damn bit of sense based on my (decades of) experience in loudspeaker theory and design. I'm involved because I have
observed audible advantages to Big E technology enclosures.
A wee bit of background on where I come from - I mainly design for the home audio and studio loudspeaker markets, and use my ears to listen critically and identify the presence of audible problems that made it past my first measure-refine-measure cycle, so that I can correct or at least minimize such problems in a subsequent measure-refine-measure cycle. I've had some success with this approach. For instance, in the current issue of Mix Magazine, a studio that uses mains I designed is honored in their "Class of 2013" feature article.
Okay, if you really want to play the skeptic card, you can discount my observations, along with those of anyone involved with Big E products for profit, and maybe even the observations of anyone who isn't trained and highly experienced at critical listening... but that still leaves one person. There is one person who has posted in this thread whose ears I would trust more than my own measurements. If this person told me that my cab had thus-and-such problem, even if I'd never seen it in my measurements or heard it with my ears, I would believe him.
That person is nomatic.
Nomatic is a high-end recording industry professional, a genuine world-class authority and expert in the field of making accurate observations by ear. Go back and re-read his
observations, because they count for far more than the measurements you keep asking for.